Most Recent Product Questions
  1. Rated: 124
    10/10/2016 7:54 PM Baader UV/IR Cut / L-Filter
    What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?

    Answer rated: 138
    Our largest cell mounted filters measure 2" (50.8mm) in mechanical diameter (having a metric thread of M48). The optical clear aperture is 46 mm. In order to ease the adaptation of our 2" filters onto most camera lenses, we do produce a 2" filter-holder, to convert from the ASTRO-2" Standard (M48) into a more common photo-standard of SP54 mm ("SP"means this is not a metric thread).
    For adapting any cell mounted Baader 2 inch Filter onto a camera lens with 52mm front filter thread you will need:
    #2408166 Baader DSLR 2" Filter-Holder M48 / SP54:
    #2958052 Baader Lens-Adapter-Ring SP54 / M52:
    Based on the SP54 thread, we offer many more adapters for various camera threads, our so-called Hyperion DT-rings.
    Answer by: Baader Web Team (Admin) on Oct 11, 2016 5:08:00 PM
  2. Rated: 57
    4/30/2017 11:39 PM Baader Ultra-Narrowband H-alpha 3,5nm Filter
    I've got filter set h-alpha,h-beta,sII,oIII for full frame ccd, when will arrive the filter size 1.25" for h-alpha 3.5nm?

    Answer rated: -16
    The H-alpha 3.5nm filter in 1.25" size will become available in approx. four months. Thanks for your patience
    Answer by: Baader Web Team (Admin) on May 2, 2017 8:24:00 AM
  3. Rated: 54
    12/1/2016 10:36 AM Baader Multi-Purpose Vario Finder 10x60 (single or with MQR-IV finder holder)
    Is the erecting prism, part no 2456130, compatible with the Vario Finder (Baader T-2 / 90° Baader Roof-Prism with BBHS ® coating (T-2 part #02), and can I use the supplied eyepiece with this combination?

    Answer rated: 25
    Yes, the T-2 90° BBHS prism is perfectly compatible with the Vario-Finder. The supplied eyepiece of the Vario Finder can be screwed directly into the housing of the erecting star diagonal.
    Answer by: Baader Web Team (Admin) on Dec 2, 2016 12:03:00 PM
  4. Rated: 48
    11/22/2017 3:00 PM SET: Hyperion Universal Zoom Mark IV + Hyperion Barlow 2,25x (8-24mm / 3,6-10,7mm)
    Why is the Barlow not compatible with spotting scopes

    Answer rated: 2
    Spotting scopes do not work with all eyepieces, because they don't offer the same back-focus like an astronomical telescope. We had to shorten the housing of the Zoom eyepiece to get into focus with all spotting scopes. You really have to fight for every millimeter.

    The problem is that the front lens of the scope basically creates an image in a given distance, which is then magnified by the eyepiece. So, you need to get the eyepiece close enough to the front lens. In a spottin scope, the erect-image prism is mounted fix inside of the tube, and you can't get close enough. In a telescope, you can move both prism and eyepiece closer to the front lens.

    While a Barlow lense moves the image further to the outside, it has to be even closer to the front lens than an eyepiece - with a refracting spotting scope, you'd have to remove parts of the scope's housing to get into focus. The prism and the internal focusing mechanism are in the way...

    So, although you can attach the Barlow mechanically to a spotting scope, you wouldn't be able to reach focus and get a sharp image.

    Only if you use a telescope as spotting scope like our C5 Schmidt-Cassegrain spotting scope, you'd be able to use the Barlow - but this only works with a very small number of spotting scopes.
    Answer by: Baader Web Team (Admin) on Nov 22, 2017 3:01:00 PM
  5. Rated: 44
    9/20/2017 12:55 PM Methanfilter 1¼" (889nm, 8nm)
    What are the threads and pitch of your 1.25" and 2" filters?

    Answer rated: 30
    Our 1.25" filters have a M28.5 male (and M28.5 front female) thread / our 2" filters have a M48 male (and M48 front female) thread

    Both thread sizes come with our proprietary pitch - which is not the same for the female and male threads.
    This is our own proprietary "emergency solution" for uniting a world were manufacturers all over the world copy from each other - to the point that there are almost a dozen different pitches in use for male and female threads. Traditionally US-companies used to do a UNF-based pitch and the rest of the world went for metric threads - but these do vary from 0.5 to 0.75.

    For this reason it does not make sense to publish our non standard pitch because our pitch is made to cope with all existing metric and US-pitch standards - and as said - our solution has evolved from sheer necessity. It is a mixture of a queer pitch and under-/over-dimensioning . We will not want to declare this as a standard and get bashed up for it. It works for us and is a result of 20 years adaptation to fit our filters onto all crazy threads we have seen. And inspite of this - every now and then there comes another "dragonboat-eyepiece" were even our filters may not fit...
    Answer by: Baader Web Team (Admin) on Sep 22, 2017 1:43:00 PM
  6. Rated: 42
    11/1/2016 11:59 PM Baader H-alpha 7nm CCD Narrowband-Filter
    Do all Baader narrowband filter both UV and IR as well? I am thinking of using them with a Full Spectrum DSLR. Thanks.

    Answer rated: -32
    All Baader Planetarium narrowbandfilters are blocking UV and IR, they are made for use with fully unblocked monochrome cameras.
    Answer by: Baader Web Team (Admin) on Nov 2, 2016 3:43:00 PM
  7. Rated: 40
    11/9/2016 10:31 AM 2" Amici-Prisma 90°, beidseitig mit 2" Steckanschluss
    I have some questions regarding your Amici-prism 2" diagonal:

    1. Does it really have only 30 mm clear aperture? Is it not too small for 2" eyepieces like Nagler 31 mm (42 mm fieldstop)? No vignetting?

    2. What is the length of the light path in this diagonal?

    3. I'm thinking about using this diagonal in a 80/400 refractor, with Teleskop-Service flattener TSFlat2 (, which has normal 2" filter thread. Can the nosepiece of the diagonal be unscrewed, and the flattener screwed to the body of the diagonal itself? (so the flattener would work as a nosepiece). In the description there is the information that "innenanschluss" is M48 thread, and this - I think - is equal to standard 2" filter thread...
    Kind regards, Piotr Kierzkowski

    Answer rated: 15
    This 2" Amici has got indeed a clear aperture of ca. 38mm, so it should work quite well with your eyepiece. Unfortunately, we do not have the data about the light path at hand.

    The nosepiece on the telescope-side can be removed, the housing has got an M48-filterthread, too. Only the eyepiece clamp can't be removed.
    Answer by: Baader Web Team (Admin) on Nov 9, 2016 2:58:00 PM
  8. Rated: 39
    12/19/2017 5:04 AM Baader SC / HD Ultra Short T-Adaptor, 7mm optical length
    I'm trying to connect a Mallincam DS2.3+ to a Hyperion Mark III Zoom 8-24mm. The DS2.3+ has what seems like a M25f thread. What adapter rings are required?

    Answer rated: -34
    The Malincam comes with a C-Mount thread so you´ll need this two adapters because the EP has M43 thread:
    A lot more possibilities for adaptions you can see here (especially the last page for the video modules):

    Answer by: Baader Web Team (Admin) on Dec 19, 2017 10:18:00 AM
  9. Rated: 35
    8/14/2017 11:46 AM Solar Viewer AstroSolar® Silver/Gold (1pc, 10pc, 25pc, 100pc)
    Wrinkles, folds, creases - is my Baader AstroSolar Viewer safe?

    Answer rated: 13
    Your AstroSolar Viewer is perfectly safe. Each single viewer has been safety-tested and is tucked into it's own protective poly-bag. After each time you used it put it back into it's poly bag and it will serve you for years to come (the next total eclipse in the US will commence on April 8th 2024).

    Like published many times for AstroSolar Film, the film is mounted loosely in it's paper frame to retain the ultra high quality which AstroSolar is known for. When looking at the film you might have the impression it would show wrinkles - and this is perfectly normal and that's how it ought to be. All our product images do show how this will look like. Wrinkles in this case are a sign that the film is mounted correctly. What we do not let pass though are real folds and creases in the metal film. Even these will not be dangerous in the least - but they could impair the high optical quality of the solar image.

    Do not let the viewer fall into dirt, do not let it collect dust over some weeks, do not put it flat on a table while rubbing it back and forth - that is - do not violently scratch off the metal coating visible at the front side. AstroSolar film is metallized on both sides. Even some scratches on the front side will not be dangerous for your eyes! This material has a 25 years history and we stand behind it. In addition, the special (non-soot) black film that complements the metal film will work as an added safety layer and definitely the combination of materials will keep your eyes out of harm.

    Even so we do insist that each viewer must be tested by you as well before each use, to check if any changes have appeared over time due to wrong handling or improper storage. If your viewer is torn from age or use, if it shows bright pinpoints during a short glimpse towards the sun, then discharge it and get a new one.

    Answer by: Baader Web Team (Admin) on Aug 15, 2017 9:49:00 AM
  10. Rated: 29
    9/16/2017 5:33 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Which Baader 2" ClickLock should i choose for my meade lxd55 emc 127 mm refractor ?
    Thanks !

    Answer rated: 11
    Unfortunately, we do not have the technical data for all telescopes on the market, especially not for older models. To answer your question, we would need to know which threads are available on your focuser. If this information is not included in the manual, you'd have to contact the manufacturer.
    If there is no thread available, but the telescope has got enough backfocus and already a 2" clamp, you can use either #2956237 37mm ClickLock extension or #2956247 47mm ClickLock extension, or even the Baader 2" ClickLock Diagonal Mirror #2956100 - then you don't have the Clicklock at the telescope, but at least you can use it whenever you change the eyepiece.
    Answer by: Baader Web Team (Admin) on Sep 20, 2017 11:21:00 AM
  11. Rated: 29
    4/25/2017 2:58 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Celestron Edge HD 8" SCT. After a few months using the 40mm kit eyepiece, I'm looking to purchase a couple of Hyperion eyepieces. What ClickLock components would be required to mount this?

    Answer rated: -12
    To use 2"-accessories with an SCT or EdgeHD, we recommend the following parts:
    #2956220 SC-Clicklock (for 6", 8", 9¼") or #2956233 SCL-ClickLock (11", 14")
    #2956100 Baader 2" ClickLock Diagonal Mirror or #2456115 Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
    optional: #2956214 Baader 2" to 1¼" ClickLock Reducer (T-2 part #15B) (all Hyperion an Morpheus eyepieces can be used with the 2" barrel; this reducer is only necessary for 1,25" eyepieces)

    Especially if your telescope is mounted on an Alt-Az mount, you can use the Baader 2" NexStar locking ring #245827 instead ot the SC-ClickLock to permanently mount the mirror at the back of the telescope - if you remove the nosepiece from our star diagonals, you get an SC-thread which fits directly at the telescope. This way, so can save some space and do not risk that the telescope hits the base of the mount when you point it high at the sky.
    Answer by: Baader Web Team (Admin) on Apr 26, 2017 8:57:00 AM
  12. Rated: 29
    12/4/2017 7:27 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    I'd like to use the mpcc mk3 with this eyepiece. Where is the field stop located?

    Answer rated: -9
    Please see following link:
    Please mention the reference surface which is the determining factor.
    Answer by: Baader Web Team (Admin) on Dec 4, 2017 8:01:00 AM
  13. Rated: 28
    5/6/2017 6:25 PM 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons)
    I want to connect my existing EOS T-ring to the Baader MPCC. Does the item on the webpage come with the necessary spacers, or will I have to buy additional items?


    Answer rated: -13
    If you use any standard T-2-ring, you can use the MPCC without any other adapters - the ring will give you the necessary distance of 55mm to the sensor of your DSLR. This is the standard-distance which was also used bei camera lenses with T-2-thread.

    Only if you have a low-profile T-2-ring like #2408318 or if you use the M48-thread, you'll have to use additional spacer rings.
    Answer by: Baader Web Team (Admin) on May 8, 2017 9:41:00 AM
  14. Rated: 26
    12/28/2016 9:00 PM Baader Double Polarizing Filter
    I am going to be shooting a full solar eclipse this summer. My thoughts are to use a 400mm Canon lens with a 2x converter. The barrel thread is 77mm what do you recommend?

    Answer rated: 0
    We would need the outer diameter of your lens to answer correctly. You will probably need an ASBF 70 or 80 filter.
    Please check out our Baader Solar Filter Finder tool to make sure by yourself:
    Answer by: Baader Web Team (Admin) on Jan 9, 2017 8:26:00 AM
  15. Rated: 25
    10/8/2016 2:40 PM Maxbright Binocular incl. case
    I would like to ask if the release date of the successor model is already known? Thank you in advance.

    Answer rated: -105
    Please excuse, the release date of the Maxbright G2 is not confirmed and we do not want to have people waiting too long. Maybe you could find a used model somewhere to ease the wait. At any rate, we are working hard to make it very good - seriously better than the G1 Maxbright.
    Answer by: Baader Web Team (Admin) on Oct 10, 2016 10:13:00 AM
  16. Rated: 25
    10/16/2016 6:12 PM Baader 2" ClickLock Diagonal Mirror
    Is the 2" ClickLock Diagonal Mirror (# 2956100) threaded for standard 2" filters? Thanks!

    Answer rated: -11
    Yes indeed, it is threaded for 2" (M48) filters.
    Answer by: Baader Web Team (Admin) on Oct 24, 2016 9:01:00 AM
  17. Rated: 24
    11/12/2016 11:14 PM Baader zero-tolerance protective Canon DSLR T-Ring T-2/M48 and 2"
    Does this T ring assembly fit the Baader 2 inch semi-apo filter?

    Answer rated: -6
    The 2" nosepiece has got a 2" filterthread, so you can use any filter mounted in a 2" filter cell.

    But you can not use the filter compartment of the Protective T-Ring for this filter, as this requires filters with 50.4mm diameter. Anyway, you can use it to use the 2" SemiApo and another 50.4mm filter at the same time.
    Answer by: Baader Web Team (Admin) on Nov 14, 2016 10:16:00 AM
  18. Rated: 23
    5/4/2018 11:04 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    Does the Alan Gee come with the spacer tubes described in the manual or are those purchased separately?

    Thank you.

    Answer rated: 5
    The two 19mm spacer tubes are included; only the various T-2-extensions are not included.
    Answer by: Baader Web Team (Admin) on May 7, 2018 8:21:00 AM
  19. Rated: 23
    11/28/2018 1:22 PM ASSF: AstroSolar Spotting Scope Filter OD 5.0 (50mm - 150mm)
    Can I use AstroSolar films at deep temperatures

    Answer rated: -20
    For exactly this purpose we do supply the ASTF-series of mounted solar filters. The fastening rim on which the film is affixed to has the same expansion coefficient as the film itself. and that very ring is free-floating in the cell that mounts onto the telescope tube.

    Hence there is no stress build-up extended onto the film as it shrinks with temperature variation.

    The film itself will not be harmed by temperatures between -50°C up to +50°C. Below the film will become stiff and further below (- 100°C) even brittle. Above 50°C the adhesive that fastens the film onto its mounting-ring may start to become soft - in case that temperature persists for longer than 24 hours.
    Answer by: Baader Web Team (Admin) on Nov 28, 2018 1:24:00 PM
  20. Rated: 23
    8/1/2017 3:51 PM Baader Neodymium (Moon & Skyglow) Filter
    Which size filter is most suitable for Hyperion eyepieces? Also, where does it attach?

    Answer rated: -12
    The 1.25" version fits to all Hyperion eyepieces except the 31 & 36mm Hyperion Aspheric. They have a filter thread at the 1,25"-barrel. For the Hyperion Zoom, you have to use the 1,25"-barrel (which is possible even in the 2"-configuration with the Mark IV Zoom, but not with the older models).

    If you also use 2" eyepieces, most reducers from 2" to 1.25" like our 2" to 1¼" ClickLock Reducer #2956214 also have a 2"-filterthread included.
    Answer by: Baader Web Team (Admin) on Aug 2, 2017 8:48:00 AM
  21. Rated: 22
    5/24/2017 9:35 PM 2" BDS-RT Baader Diamond Steeltrack Focuser
    Is there an RT adapter to fit a Steeltrack focuser to a Skywatcher EQUINOX 80 please?
    Thanks, Paul

    Answer rated: -15
    We would love to see our Diamond Steeltrack on as many telescopes as possible. However we cant answer this question for certain, since we don't sell this telescope and thus don't know the thread sizes, backfocus and so on. You could send us your scope and we would inspect it and check if we have a fitting adapter - if not we could produce one.
    If you don't want to send us your scope, we would need precise measurements of the thread sizes / pitch as well as measurements or specs from your telescope to evaluate the backfocus. Please send images of all measuring steps.
    Answer by: Baader Web Team (Admin) on May 26, 2017 1:30:00 PM
  22. Rated: 22
    7/3/2017 10:44 PM Baader Ultra-Narrowband H-alpha 3,5nm Filter
    I understand your 3.5nm Ha filter in 1.25" size will become available later this year. When will you produce 3.5nm filters of the same size in SII and OIII? Thank you.

    Answer rated: 12
    We are working on these filters, too, and hope to have them ready by the end of the year - but we can't promise it.
    Answer by: Baader Web Team (Admin) on Jul 5, 2017 12:34:00 PM
  23. Rated: 21
    10/7/2016 1:08 PM 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons)
    I purchased the Hyperion Zoom and the MPCC Mark III. Can you tell me how to adapt the eyepiece to the coma corrector?
    I also want to use other eyepieces. How do I know the right distance between fieldstop position and the MPCC?

    Answer rated: -6
    We found this question very important and wrote an extensive answer with application images for other customers with similar question. Please check out the following blog post: "Perfect Coma Correction with Baader-MPCC – But how to adapt eyepieces?"
    Answer by: Baader Web Team (Admin) on Oct 12, 2016 2:37:00 PM
  24. Rated: 21
    5/25/2017 10:41 AM 2" BDS-SC Baader Diamond Steeltrack® Focuser
    Please, where in this focuser should my f/6.3 Celestron focal reducer (CFR) go? Currently, my imaging train would be:
    C11 --- (¿CFR?) --- BDS-SC --- (¿CRF?) --- ASI174


    Answer rated: -15
    You need to keep the distance between corrector and camera. So, it's the best if you put it between focuser and camera.
    Answer by: Baader Web Team (Admin) on May 29, 2017 10:31:00 AM
  25. Rated: 21
    12/10/2017 8:12 PM Baader T-2 / 7.5 mm Extension Tube (T-2 part #25C)
    I need a lockable T-2 extension, total length about 10 mm (for use with the Geoptik CCD-Canon connector). Can the 7.5 mm T-2 extension be combined with the #33 locking ring to achieve this? If not, is there another T-2 system item(s) for this? Thanks.

    Answer rated: -8
    Unfortunately, you can't combine these two parts this way. But the male and female threads of this adapter are ca. 5mm long, so I'd recommend that you use e.g. two 1.4mm T-2 spacer rings from the set #2458102 and put one on each side of the adapter. This way, you get very close to 10mm without loosing much of the threads - so you still have a secure connection to your camera.
    Answer by: Baader Web Team (Admin) on Dec 11, 2017 9:35:00 AM
  26. Rated: 21
    2/2/2017 7:55 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Is the optics of this zoom eyepiece improved or modified if compared to the previous version? If yes, how?

    Answer rated: 7
    Many things have changed on the new Mark IV version as you can see in the product description and the instruction manual. Amongst others 4mm backfocus gain, improved zooming mechanism even at cold temperatures, new safety-kerf barrels and so on. However, we didn't see a need to change the proven, high-quality optics of the Hyperion Zoom. It is and always has been performing very well.
    Answer by: Baader Web Team (Admin) on Feb 2, 2017 10:33:00 AM
  27. Rated: 20
    3/7/2017 2:34 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I recently purchases a 2" Baader Clicklock visual back to use with my EdgeHD 8" SCT. My issue is that the system is too tight and binds up. When I put a 2" diagonal or eyepiece into the clicklock and go to lock it I can only get about 1/2 of the rotational movement before it gets tight to the point of binding up.

    Is this an issue or is it designed like this? I also thought that the part would be smooth when rotated, but I can feel distinct clicks so to speak. I just want to make sure that this unit is good and not defective, and I have never use this type of system before

    Answer rated: -17
    What you describe is completely normal. You only have to turn the lever by about 15 - 20° - if really the 2" barrel has the correct standard diameter. The lever moves much further in order to provide secure clamping action also for badly undersized 2" sleeves/barrels, which we have seen in this industry. A 15-20° turn for standard eyepieces will already put a lot of force onto a 2" barrel - you will note that it will hold your eyepiece or diagonal very firm and securely. You should not try to tighten it up as hard as you can! There is no need to extend a large force when clamping an eyepiece.

    The distinct clicks are part of the design. This was designed to let people hear and feel the lever position also in the dark.
    Answer by: Baader Web Team (Admin) on Mar 8, 2017 11:27:00 AM
  28. Rated: 19
    6/11/2018 3:28 PM 2" BDS-NT Baader Diamond Steeltrack® Focuser
    I bought recently this focuser, but i made the hugh mistake to move the drawtube align screws and now nothing work correctly the tube is no more aligned. Do you have a trick to put the drawtube perfectly on axis ? I tried but its not okay at all.....

    Thank you

    Answer rated: -10
    Please check out page 12 + 13 of our Diamond Steeltrack instruction manual:
    We tried to be very explicit that this alignment procedure is very delicate. Please note the following red text that we wrote on page 12:
    "Please read the following thoroughly and only proceed with the alignment procedure if you feel well informed about what you are doing"
    Answer by: Baader Web Team (Admin) on Jun 11, 2018 3:33:00 PM
  29. Rated: 19
    12/3/2017 6:02 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Which 2" Baader Clicklock will suit my Orion ED80 CF?

    Answer rated: 9
    We don´t sell Orion products so we don´t know how your present clamp is mounted. You can unmount your clamp to find out what size is
    given on your focuser or ask a dealer who sell this type.
    Answer by: Baader Web Team (Admin) on Dec 4, 2017 9:05:00 AM
  30. Rated: 18
    9/8/2016 8:02 PM Baader 2" ClickLock Diagonal Mirror
    Is the housing for this diagonal CNC machined? And what features are there that ensure proper alignment of the mirror? What are the features of the mirror glass?

    Answer rated: 6
    The mirror seat of the diagonal body is machined, to provide a defined position.
    We do regard the mirror substrate of our dielectric diagonals a proprietory information. As you may have heard, a dielectric coating with as much as 50 coating layers can extend an enormous amount of stress onto the mirror substrate. Many proudly offered dielectric mirrors suffer under "power" - means the surface bends under the coating stress and over time develops a very weak spherical shape. For this reason we use a hardened variety of borosilicate glass, which can sustain the plane polished surface to remain in perfect order. Admittedly this substrate has somewhat larger index of expansion and does take longer to regain its optical shape when subjected to large temperature differences - but only when compared to our BBHS mirror-diagonals which feature a hard-silver coated glass-ceramics (Astro-Sitall) as substrate.
    However - we had extensively tested this combo of coating and substrate to be a perfect match for our dielectric diagonals - especially ensuring a longlived product that does not change in optical quality over time. Please read more about the mechanical and optical properties of our BBHS-diagonals, as well as our marketing philosophy, to not participate in the usual number competition here:
    Answer by: Baader Web Team (Admin) on Sep 14, 2016 11:09:00 AM
  31. Rated: 18
    2/12/2018 12:22 AM Baader DSLR-2" Filter Holder M48/SP54
    Could you tell me the exact products I need to fit a 2” filter to a DSLR lens of 58mm diameter please?

    Answer rated: 1
    You need the following two parts:

    # 2408166 - Baader DSLR-2" Filter Holder M48/SP54
    # 2958058 - Baader Hyperion DT-Ring SP54/M58

    Then you can mount your 2"-filter onto the M58-filter-thread of your lens.
    Answer by: Baader Web Team (Admin) on Feb 12, 2018 8:20:00 AM
  32. Rated: 18
    2/3/2019 12:35 AM 2" BDS-SC Baader Diamond Steeltrack® Focuser
    Hi, I would like to know if the 2" BDS-SC Baader Diamond Steeltrack® Focuser fits to my NexStar SE SCT 6".Best Regards Fermín

    Answer rated: 6
    Yes, you can attach the Steeltrack to a 6" Schmidt-Cassegrain, but to do so, you have to remove the rubber cover from the telescope's focussing knob. Then you'll have enough space for the SteelTrack. Unfortunately, there is not enough space between the Steeltrack and the brass focussing drive of the 6" Schmidt-Cassegrain to reattach the rubber cover; but you don't need it once the Steeltrack focuser is attached.
    Answer by: Baader Web Team (Admin) on Feb 4, 2019 8:32:00 AM
  33. Rated: 18
    9/15/2017 2:30 PM Baader 31mm Hyperion Aspheric 2" Eyepiece
    Is the 72° available with the 31,75mm plug-in sleeve?

    Answer rated: -16
    No, there is indeed an error in the technical specs data sheet, we will correct this ASAP. The apparent field of view when using the 1.25" barrel is 55°
    Answer by: Baader Web Team (Admin) on Sep 15, 2017 3:21:00 PM
  34. Rated: 18
    10/7/2018 8:34 PM 2" BDS-NT Baader Diamond Steeltrack® Focuser
    Can the Diamond Steeltrack NT focusser be installed on a Skywatcher MN190 without drilling holes?

    Answer rated: -1
    Only our discontinued Classic Steeltrack NT focuser was able using the holes when disassembling the original Sky-Watcher focuser. Then only
    when having the focus wheel axis 45° to the OTA axis.

    Please notice our website for instructions how to mount the Diamond Steeltrack - as you can see there have to be new holes done to mount it.
    You need to have access to the inner tube holding the nuts but the Makstutov Correctore is closing it - I´m sorry.
    Answer by: Baader Web Team (Admin) on Oct 8, 2018 2:26:00 PM
  35. Rated: 18
    7/3/2017 9:24 PM Baader 2" Amici-erecting-prism 90° with 2" holder and 2" sleeve
    I would like clarification on the threads / interfaces with the prism holder body. You state the Lens Side has both an inner connection that is M48-.75mm thread and an outer connection 2" barrel....does the 2" barrel screw into the M48-.75mm thread in the prism holder body? or is the interior of the 2" barrel threaded with M48-.75mm? On the Eyepiece side, is the clamp removable at all? Is it threaded in or pressed fit in? If either, please specify. Do you have a CAD model of the assembly you can share?
    Thanks, James Riall

    Answer rated: -4
    The 2"-nosepiece of the prism has got an M48-thread for 2"-filters, so you can attach 2"-filters in front of it. The nosepiece is removable and also attached with an M48-thread to the housing.

    The eyepiece clamp is not removable.

    I'm sorry, but we can't publish CAD-drawings of the housings - there is too much "Cut&Paste-Copying" in the times of the internet.
    Answer by: Baader Web Team (Admin) on Jul 5, 2017 9:53:00 AM
  36. Rated: 17
    3/6/2017 9:34 AM Baader Neodymium (Moon & Skyglow) Filter
    I note that you do not provide either the Neodymium Filter nor the IR-Pass Filter in a version that is 'Square 50 x 50mm unmounted', is this correct?
    In relation to both Filters' Wavelength Spectrum Response what alternative Filter(s) do you have that has the nearest spectrum response in the 50 x 50mm unmounted version? Preferably 3mm thickness.
    The reason for this enquiry is to have a useful 'Luminesence' filter for Lunar and Planetary Astrophotography when the rest of the filters are for Deep Sky Imaging (Baader CCD Complete Filter Set II 50 x 50mm #2459544).

    Answer rated: 11
    To make it short, unfortunately we currently don't offer either in 50x50 with 3mm thickness because it will dim image compared to our 2mm substate thickness filters.

    Answer in detail: We are sorry, we never felt the Neodymium-Filter to be of intense enough value for CCD-imaging (but very nice for planetary lucky imaging!), hence it is being handled as perfect visual/videography filter here and only av. cell-mounted in 1 1/4" and 2" (2" being a size which already does serve well for DSLR-imaging and were we have all adapters available to put this filter in front of any DSLR-camera lens - or to use our UFC- filter changer for mounting it in front of any CCD-camera.

    The neodymium substrate will become very expensive in 50x50 x3 mm size and we already must go through a lot of glass to cancel out substrates with striae and other pouring defects. If you find someone offering this substrate in that size and thickness, you should very carefully check it for optical defects as most people do not do this careful glass selection, nor do they polish each filter substrate on an auto-deck-polisher, nor do they apply a truly high efficient BBAR-coating on both sides. Actually most are just usurping the name of the substrate while supplying very mediocre optical quality.

    If you have evidence of people using our smaller neodymium-filters successfully as "L-filter" substitute in a regular CCD-camera filter wheel, then please let us see the links. If it is reasonable we may enter into such a project - but the resulting price may be double of a cell-mounted 2" filter. Also keep in mind that the 1 mm added thickness will definitely cause some loss in transmission!

    Regarding the IR-pass-filter in 2 mm thickness: These are perfect for lucky imaging/videography. Hence 95% of these filters are being sold in the 1 1/4" cell-mounted version in 2 mm thickness. Again - offering this in 3 mm thickness will reduce transmission and not offer enough benefit for regular CCD-imaging (just our 2 ct´s).
    Answer by: Baader Web Team (Admin) on Mar 6, 2017 9:35:00 AM
  37. Rated: 17
    4/8/2018 3:29 AM Baader 2" ClickLock Diagonal Mirror
    How secure is the nosepiece when coupled to the diagonal body? Is there any risk of it loosening when subjected to heavy loads with the diagonal oriented horizontally?

    Answer rated: -5
    The nosepiece is extremely secure and is able to hold even very heavy payload. We've tested it with a C14, see here: (but this is not recommended for imitation).

    Also we recommend to check out this Youtube Review:
    Answer by: Baader Web Team (Admin) on Apr 9, 2018 9:25:00 AM
  38. Rated: 16
    8/10/2017 12:24 AM Baader f/2 Highspeed-Filters (H-alpha, O-III, S-II)
    I have a set of these. I was imaging at F2.1 with hyperstar. Could I use them at F3.6 or F5.0? (TAK with 0.73 reducer and native F)
    What degradation or other issues occurs at these slower speeds?

    Answer rated: 6
    Taking into account the high speed systems properties, these filters have a shifted CWL (Central Wave Length), where the peak is not congruent with the H-alpha, SII or OIII emission lines. This shift is calculated carefully and tested in such way that the best images can be obtained with very fast focal ratio telescopes. f/2 and f/3.6 are suitably close to each other, so the CWL does cover the range from f/2 to f/3.5. A telescope with an f-ratio of f/5 or f/10 actually might render a weak signal though.
    Even using these filters at f/3.8 might already result in a small loss of signal - that is - longer exposure time and consequently contrast might suffer a bit. Other than that - due to the mismatch some offband light might reach the chip but it shouldn´t be a huge concern. The most problematic filter is the H-alpha. Both SII and OIII have two emission lines which are close to each-other, so you will still be able to get part of both these lines. H-alpha in comparison to the other two, has a really tight bandwith.
    Answer by: Baader Web Team (Admin) on Aug 16, 2017 3:03:00 PM
  39. Rated: 16
    1/21/2018 6:58 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    On my Newtonian: If I'm using a MPCC w/this zoom and alternating between visual and T2 w/Nikon APS-C, is there some sort of extension I could use (clicklock preferred), so that I don't have to add/remove the focuser ring extension each time? To make matters even more fun, this will be used on a Bresser Hexafoc... Is this doable?

    Answer rated: -47
    Unfortunately, I don't see a solution for this - the camera has to be adapted directly onto the T-2-thread of the MPCC, so this thread must remain accessible. Even if you attach a T-2-Clicklock to the MPCC, you'd have to unscrew the Clicklock to attach the camera.

    So, you can't get rid of the T-2-thread, there is no space for any quickchanger, once the camera is attached.

    The only solution I can think of at the moment for more comfort would be an additional MPCC which is attached permanently to the camera adapter...
    Answer by: Baader Web Team (Admin) on Jan 31, 2018 9:45:00 AM
  40. Rated: 16
    2/22/2018 2:31 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have two questions about the 2" ClickLock 2" CL-Extension 47mm.

    1) How long is the overall length of this adapter including the 2" nosepiece. I know the optical length is 47mm, so how long is the attached 2" nosepiece?

    2) How deep can a 2" eyepiece be inserted into this adapter? I have a 2" eyepiece with a 38mm nosepiece. Will I be able to seat it all the way in?


    Answer rated: -29
    The length over all is 74mm so the 2" nose piece telescope side is 27mm long (74mm-47mm). The ClickLock body takes 2" barells up to 36mm deep.
    Answer by: Baader Web Team (Admin) on Feb 22, 2018 8:39:00 AM
  41. Rated: 16
    3/28/2017 3:24 PM
    Tell me, please, will this tail be compatible (# 2451101) with Celestron CPC 1100 Edge HD? And if not, what advise? Thank you!

    Answer rated: 0
    Yes, this dovetail bar fits perfectly. Please see also the PDF under the tab "Downloads":
    Answer by: Baader Web Team (Admin) on Mar 28, 2017 3:54:00 PM
  42. Rated: 16
    3/28/2017 8:13 PM Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
    Tell me, please, what is the best diagonal to choose for observing objects of distant cosmos and planets:
    Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
    Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
    And yet, the mass of them is indicated the same, is there any error here? The prism should be heavier? Thank you for your responses!

    Answer rated: -2
    There was indeed an error in the specs, the mirror weighs 451g and the prisms weighs 513g. Regarding your question which to choose:
    Usually prism diagonals are better suited for long focal length refractors and mirror diagonals for short focal length mirror telescopes.
    This is because the total reflection with prisms is suboptimal when using short focal lengths due to nonlinear light reduction with high angle side light rays and chromatic prism effects. Also there are shifts in backfocus and it can influence the correction of high quality optics due to the glasspath (the speed of light is lower inside a dense medium like glass in comparison to air).
    On the other side mirrors don't have the same maximum reflection values like a prism's lossless physical total reflection. Also a mirror is much more sensitive to transmission reduction when exposed to the air (sensitive silver layer getting weak very soon).
    But with the Baader BBHS self protecting silver reflection layer on both diagonals (mirror and prism) the backsides of both principles are well compensated, this means the mirror diagonal will not loose any light due to aging anymore and the general light angle sensitivity of the prism diagonal due to reliance on total reflection alone is compensated by the additional BBHS layer below the total reflection hypotenuse area.
    So the decision between diagonal mirror or prism is not as critical as it was until now.
    But still a short focal length instrument favours a mirror diagonal.
    Answer by: Baader Web Team (Admin) on Mar 29, 2017 10:49:00 AM
  43. Rated: 16
    4/28/2017 10:59 PM Baader f/2 Highspeed-Filters (H-alpha, O-III, S-II)
    What is the band width (nm) of the F2 Highspeed narrow band filters?

    Answer rated: -40
    I'm sorry but we can't publish this value - to make them work at f/2, we had to use rather unusual values, which we can't publish so far. But if you take a look at the images made with these filters, you'll see that they work - that's better than every transmission graph.
    Answer by: Baader Web Team (Admin) on May 15, 2017 2:06:00 PM
  44. Rated: 15
    10/12/2016 10:43 PM Baader1¼" Amici-erecting-prism 45° with 24mm free aperture
    I am looking for a 45 degree 1-25" correct image diagonal. I want it to look at the view across the bay, and the image to be the same as looking through a pair of binoculars.
    Would your article part no.2956150 do the business. Is there any other options.

    Answer rated: 6
    Yes, this item will do the job!
    Answer by: Baader Web Team (Admin) on Oct 27, 2016 3:17:00 PM
  45. Rated: 15
    11/10/2016 5:02 PM Mark V Großfeld (Giant)-Binocular
    What is the in focus requirement of the binoviewer

    Answer rated: 19
    The optical length of the Baader Giant Binoviewer Mark V is 113mm. We suggest to use a 1.25x glass path corrector in order to get the color correction right. This will also enlarge the backfocus of your telescope and will be enough magnification for most applications.
    Answer by: Baader Web Team (Admin) on Nov 11, 2016 9:26:00 AM
  46. Rated: 15
    10/9/2017 8:36 AM Fluorite Flatfield Converter (FFC) / 3x-8x
    There’re some discussions about FFC on the web, it seems to designed for photography, do you know anyone using it in visual?

    Answer rated: 0
    As this product was designed to provide perfectly round stars - without increasing their size - to cover the 90 mm diameter field of a 6x6 medium format camera,
    the performance is even much more impressive when it is used visually. Many people call it "worlds sharpest barlow lens" - we don´t disagree.
    Answer by: Baader Web Team (Admin) on Oct 9, 2017 8:37:00 AM
  47. Rated: 15
    12/24/2016 2:48 AM Okular Eudiaskopisch 35 mm ED 1¼"
    Do you still sell this eyepiece?

    Answer rated: 6
    The last models of the 35mm Eudiascopic eyepiece are now reserved for use together with our Mark IV Binoviewer and are not available anymore for single purchase, we apologize.
    Answer by: Baader Web Team (Admin) on Mar 27, 2017 9:52:00 AM
  48. Rated: 15
    12/8/2017 8:56 PM Baader zero-tolerance protective Canon DSLR T-Ring T-2/M48 and 2"
    I need an adapter that will allow me to attach my Nikon 610 to my Celestron 8se that will take a 2" light pollution filter for prime focus astrophotography. I currently have a T-Ring and T-Adapter provided by Celestron, but it will not take 2" filters

    Answer rated: -10
    We have the protective ring only for Canon cameras. According your question there is only the classic way using this nose piece:
    To connect 2" accessories onto the OTA we have two different rings:
    If you choose the ClickLock clamp please take Item No. #2956220 with SC-thread
    Answer by: Baader Web Team (Admin) on Dec 11, 2017 9:25:00 AM
  49. Rated: 15
    12/17/2017 9:51 AM Baader Multi-Purpose Vario Finder 10x60 (single or with MQR-IV finder holder)
    What size threads are the two screws that attach the EQDovetail adapter to the finder?

    Answer rated: -13
    It is M5 thread - we´re using screws length over all 13mm with 3mm for cylinder head.
    Answer by: Baader Web Team (Admin) on Dec 19, 2017 8:36:00 AM
  50. Rated: 14
    9/19/2016 3:39 PM 2" Glasspathcorrector® 1,8x for Refractors and SC's
    My 1.8x glass path corrector appears out of collimation on f/5 while the 1.7x works perfectly.
    I have the following: Baader 2" glass path corrector for refractors, SC and other systems. Extension factor 1.8x.

    I have tested it with various diagonals and in 3 high quality refractors with my Mark V Binoviewer.

    Everything looks good in my 180mm F7 and 101mm Petzval F5.4 refractors. But in my 140mm Petzval F5 refractor the stars appear out of collimation on regular stars as well as on an artificial star tested indoors. When I replace the 1.8X GPC with the smaller 1.7X GPC or 2.6X GPC everything looks good. The scope has perfect collimation. However, when I use the 1.8X GPC something is out. It doesn't really make sense so I am wondering if you know what might be the problem. Perhaps F5 is too fast for the 1.8X GPC. Is that correct or could it be something else I am overlooking?

    Answer rated: -23
    your assumption is correct. We manufacture two glasspath correctors with ~2" front aperture that are carefully designed to pick up the full beam to enter into the binocular.

    The 1.7x version (2" GPC only) is designed to correct the coma of Newtonian telescopes and work down to f/3.5.
    The 1.8x model is designed to work perfectly with refractor telescopes from f/8 to f/6. The design dates back to the days of Carl Zeiss APQ-Apochromates and was done by the APQ-designer, Dr. Pudenz.

    We are sorry that the 1.8x (Refractor-)GPC does not perform to your expectation at f/5, but this is the fate of every specialised design, made to perform 100 % at the target application.

    Answer by: Baader Web Team (Admin) on Sep 19, 2016 3:40:00 PM
  51. Rated: 14
    5/2/2017 10:18 PM Universal Red Dot Mount RDM
    Can you tell me what are the screw size/threading on top of the base? I want to know if they are 1/4"-20 to fit a standard camera hole. Thanks

    Answer rated: 7
    This is not a 1/4"-thread, but screws with the metric M5-thread fit into the holes.
    Answer by: Baader Web Team (Admin) on May 3, 2017 1:31:00 PM
  52. Rated: 14
    8/31/2019 4:18 PM Baader Neodymium (Moon & Skyglow) Filter
    Can I get a Baader Neodymium (Moon & Skyglow) Filter to work with a Canon 5D camera or a Canon 77mm/82mm diameter lens; rather than with a telescope? I want to minimize noise pollution when photographing night sky, stars, and Milky Way

    Answer rated: 3
    You can mount astronomical 2" filters in front of camera lenses, this works with longer focal lengths. With wide angle, there will be colour shift, depending on the filter.

    Please note, that of course you then effectively have a mask with the filter diameter in front of your lens.

    You need
    Baader DSLR-2" Filter Holder M48/SP54 # 2408166 - this provides the SP54-thread
    plus DT-rings ( and stepper rings for your camera.

    For 77mm, you need
    Baader Hyperion DT-Ring SP54/M62 for DTAdapter II&III and Hyperion Eyepieces # 2958062
    Baader Hyperion Stepper-Ring M62 onto M77 # 2958077

    For 82mm, you need
    Baader Hyperion DT-Ring SP54/M62 for DTAdapter II&III and Hyperion Eyepieces # 2958062
    Baader Hyperion Stepper-Ring M72 onto M82 # 2958082
    Answer by: Baader Web Team (Admin) on Sep 2, 2019 12:41:00 PM
  53. Rated: 14
    11/20/2018 7:05 PM Baader UFC (Universal Filter Changer)
    Will the filter base and slides be compatible with the new Celestron 8" RASA?

    Answer rated: 1
    We do not yet have an RASA 8 in our hands to adapt our UFC system to these. It will for sure take time until spring 2019 before we can come up with solutions..Please register for our newsletter to become informations about new products, adaptors a.s.o. as soon as they are available
    Answer by: Baader Web Team (Admin) on Nov 22, 2018 10:22:00 AM
  54. Rated: 14
    1/18/2017 10:37 AM Baader D-ERF Energy Rejection Filter (75 - 180mm)
    Is it possible to use a cheaper ERF (energy rejection filter) from another manufacturer or dealer for the SolarSpectrum H-Alpha filters than the D-ERF?

    Answer rated: 27
    We absolutely must point out that an ERF from another dealer may void the warranty of the SolarSpectrum H-alpha Filter, so that repairs may be payable even during the warranty period.

    You can buy cheaper standard ERFs, but they don't meet the same specifications as our D-ERF. Simple energy rejection filters are made of red dyed glass (Schott RG 610 or Schott RG 630). These are long pass filters which let all energy beyond ca. 570nm pass - this includes the full near infrared spectrum (heat radiation) above 630nm.

    The heat at the focal point behind such an ERF filter is three times higher than behind one of our D-ERFs. This way, the immersion oil in the stack of block-, polarization and Etalon-filters will boil away. An H-Alpha-filter which is permanently overheated this way will age very fast. We can not cover this with our 5-year-warranty.

    By the way: The coloured glass of these simple ERFs is rather "soft" and chemically unstable, so it can degrade over the years. The soft glass melt tends to form streaks. If they are not coated simple ERF-filters will age because of the oxygene in our atmosphere, and after some years the surface will get rough, and contrast is lost. When we were still using this glass, we had to check each and every filter on our optical bench, and many filters failed the double pass test.

    The problem with the glass quality of an RG 610 remains even when it is coated with an UV/IR-reducing coating. We tried this, too, with our C-ERF (Cool ERF), but we abandoned it after some years. The soft glass often got warped during the coating procedure, so that even less filters were useful after being coated. Our experiences with this combination lead to the development of the D-ERF (Dielectrical ERF).

    There are dealers and manufacturers who still offer such ERF or C-ERF filters but do not test them as thoroughly on an optical bench as we did. This is the reason why there are many cheaper C-ERFs and ERFs on the market - but the customer will pay for the cheaper costs a much higher price: a reduced image quality and a reduced lifespan of the H-Alpha filter, compared to a high-quality D-ERF.

    Our D-ERF filters are made of very homogeneous, fine-polished BK-7-glass without streaks. They are coated with great effort with a dielectrical coating system which is age-resistant and fine-tuned for the Solar Spectrum filters.

    A Solar Spectrum filter will outplay all its benefits (resistance to aging, sharpness and contrast) only in combination with a D-ERF, and only with this combination can we guarantee its resistance to aging. Especially a Research Grade Filter requires a good D-ERF. Every chain is only as strong as its weakest link.

    Answer by: Baader Web Team (Admin) on Jan 23, 2017 10:39:00 AM
  55. Rated: 14
    1/31/2017 5:42 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Is any adapter available that allows this eyepiece to be used on the Kowa TSN-883 spotting scope?

    Answer rated: -5
    Unfortunately this adapter is not available until now and we cannot confirm yet a definite date.
    However - all efforts done on the new Mark IV release, to aim at making this eyepiece adaptable onto most existing Spotting scopes.
    Sorry if we can not serve you right now. We will strive to do so in the future
    Answer by: Baader Web Team (Admin) on Feb 1, 2017 8:32:00 AM
  56. Rated: 14
    8/2/2018 11:30 PM Baader ClickLock Eyepiece Clamp 1¼" with built in diopter-adjustment (T-2 part #08)
    Dear Baader, can I use this clicklock to fine focus with a telescope schmidt/cassegrain?

    Answer rated: -1
    Its a very fine focusing method, very slow, but yes - it will work
    Answer by: Baader Web Team (Admin) on Aug 3, 2018 3:53:00 PM
  57. Rated: 14
    2/15/2017 9:08 AM Baader Sky-Surfer III red dot finder
    What material is the RDF made of? Can it be mounted on a Celestron Nexstar Evulotion ?

    Answer rated: 19
    The material is mostly ABS-plastic material. The Sky Surfer III can mount onto any Celestron tube that is equipped with the two screws for holding a Celestron finder - plus it has the proper shoe to fit into Vixen/SkyWatcher finder ports.

    See the detailed instructions under the tab "downloads" that explain the amount of adapters being the most extensive offered anywhere.
    Answer by: Baader Web Team (Admin) on Feb 15, 2017 9:36:00 AM
  58. Rated: 13
    1/24/2019 6:04 AM Alan Gee Telecompressor Mark II (T-2 part #20)
    Will it work on Meade ACF scts?

    Answer rated: 0
    The Meade ACF optics is a coma corrected system so unfortunately the Alan Gee Telecompressor won´t work with it because it is made
    for classic Schmidt-Cassegrain telescopes.
    Answer by: Baader Web Team (Admin) on Jan 24, 2019 11:06:00 AM
  59. Rated: 13
    2/9/2018 11:44 AM Fluorit Flatfield Converter (FFC) / 3x-8x – Weltbeste Barlowlinse
    Two Questions: Will this Barlow be effective at 2X? How can this lens provide up to a 90mm diameter image circle when the lens itself is only 42mm(?) in diameter and the light path is convergent, not divergent, between the lens and the image plane?

    Answer rated: 9
    The FFC was designed by Carl Zeiss, to cover the full 90 mm image diagonal of a 6x6 emulsion film camera and provide a flat field. This is especially valid at the 4x factor.

    A barlow lens makes individual light cones narrower, but increases the off axis light beam angles strongly since it magnifies the image which leads to a divergent field of light. So with its 4x magnification the projected field increases 4 times also, being designed to project the advertised 90mm in perfect quality. Although no regular glass combination would allow to design a divergent bundle of light to emerge from the lens groups and still retain the full apochromatic properties of a precision objective lens - such as the APQ-lenses from Carl Zeiss were. It indeed does take two differently radied cemented groups of genuine Calciumfluorite (CaF2) - crystal with equally exotic partner glasses, to retain the full apochromatic properties. There is no other lens design existing having the same complexity.

    However - the days of emulsion film are gone since long - and modern chips are much smaller still. For this reason the factor could be reduced even to 2,5x instead of 4x by moving the image plane much nearer towards the exiting lens surface than those ~150 mm required for the 4x factor. In this way, the perfectly flat and apochromatic field would be reduced to only cover a 25 mm image circle with perfection.
    When aiming to 2x it can be that the lens surface has to be extremely near to the sensor, so any dry chamber or else could hinder this.
    Answer by: Baader Web Team (Admin) on Feb 20, 2018 9:45:00 AM
  60. Rated: 13
    10/6/2016 8:38 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    What is the optical length for this product (Baader 2" ClickLock CL-SC-Clamp 2956220) ?

    Answer rated: 1
    The optical height of the SC-clamp is 47mm. Please note the technical image to our 2" ClickLock System. Its the first image linked under "Application Images". More ClickLock clamps are in production.
    Answer by: Baader Web Team (Admin) on Oct 10, 2016 10:08:00 AM
  61. Rated: 13
    5/7/2017 12:16 PM Baader M68 Tele-Compendium
    What material used to make Baader M68 Telecompendium; Universal Filter Holder Assembly? Concerned about long term galvanic corrosion affecting components if any steel used / mating surfaces. Telescope not protected against atmospheric humidity.

    Answer rated: -1
    Used material is anodized aluminum throughout
    Answer by: Baader Web Team (Admin) on May 8, 2017 8:23:00 AM
  62. Rated: 13
    6/8/2017 2:16 AM Baader Colour Filters (blue, bright blue, green, yellow, red, orange)
    When the blue filters will be available again?

    Answer rated: -2
    We expect them to be available again in approx. two months
    Answer by: Baader Web Team (Admin) on Jun 8, 2017 8:57:00 AM
  63. Rated: 13
    6/1/2018 6:45 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    I have an older Meade LX200 7" Maksutov telescope. Can I use the Alan Gee telecompressor with it, both visually and photographically? What additional tubes or accessories would I need?

    Answer rated: 2
    The Alan Gee was designed for Schmidt-Cassegrains with f/10. We haven't had the chance to test it at f/15, and we don't have a Meade Mak here to test it, so unfortunately we can't give you a definite answer.

    But usually, it's much easier to use a lens at a slower f/ratio than it it was desingned for, than to use it at a faster f/ratio.

    For the adaptation to SC-threads or 2"-focusers, please take a look into the manual which you can find in the download section of the website.
    Answer by: Baader Web Team (Admin) on Jun 4, 2018 9:02:00 AM
  64. Rated: 12
    8/15/2017 1:03 AM Solar Viewer AstroSolar® Silver/Gold (1pc, 10pc, 25pc, 100pc)
    Am only ordering one pair. will it be here by the time of the Eclipse?

    Answer rated: 26
    We don't ship to the USA from our website - and even if we would, unfortunately you wouldn't get your Solar Viewer in time for the eclipse. Please inquire at US dealers.
    Alternatively, here is an option to observe the eclipse in full safety without buying any commercial product:
    Answer by: Baader Web Team (Admin) on Aug 15, 2017 9:56:00 AM
  65. Rated: 12
    5/25/2019 1:47 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Can it work with Canon Eos M cameras?

    Answer rated: 10
    Yes, it works with all kinds of EOS cameras. Please note that you need an additional 40mm T-2 extension to compensate the shorter way to the sensor in the camera housing
    Answer by: Baader Web Team (Admin) on May 27, 2019 9:26:00 AM
  66. Rated: 12
    9/21/2017 2:57 AM Hyperion Zoom 2.25x Barlow lens
    Can I use this kit with my Brandon Vernonscope 80mm apochromatic F6 480mm focal length?
    Thank you!

    Answer rated: -20
    The Hyperion Zoom Barlow lens will work perfectly with your Brandon Vernonscope.
    But you need the ClickLock 1,25" clamp to use it with your 1,25" eyepieces, please see this graphic
    Answer by: Tobias Baader (Admin) on Sep 26, 2017 4:46:00 PM
  67. Rated: 12
    5/5/2017 4:44 PM Hyperion Universal Zoom Mark IV, 8-24mm Okular (1¼" / 2")
    Somewhere I read that the Mark IV zoom was made water and dust resistant (waterproof?). Is this correct? This is more important for spotting scope user probably than astro users but would be a great feature. I suspect the zoom mechanism would be hard to seal though.

    Answer rated: -4
    The top lens doublet as well as the zoom ring on the Mark IV and previous Hyperion Zoom models are indeed O-ring sealed, to permanently shield off water (and dust) entry when the Hyperion Zoom is exposed to sudden rainfall. while inserted into a spotter for instance.

    What is not sealed in the same way is the front lens element inside the 1 1/4" nose piece during its travel up and own. We sacrificed that O-ring seal in all zoom models in order to make the Click-mechanism work effortless and to avoid that "hard feeling" of most other zooms when changing magnification. This is certainly a concession to its primary use on astronomical telescopes. Here the zoom ring must work without "resistance". On most other zooms the telescope will come off target or start to "wiggle" everytime when rotating the zoom ring actually is a real effort.

    Effortless handling - is what we try to achieve with this zoom - as well as intuitive indication of the distinct magnification stops. This smoothness in operation is just one of the reasons that made this Zoom such a success among Astro-Amateurs - without most people noticing even why they have that positive feeling, compared to using other zoom eps.

    Also when using the Mark IV on your spotter you will find it a side-benefit, to reach high magnification without loosing target - just because the zoom were so darn stiff to rotate.

    For your application attached to spotting scopes, what remains is that you won´t have any water entry while the Hyperion Zoom is mounted onto the spotting scope. The bottom design of the zoom creates an overlapping shield, to not have water creeping into the 1 1/4" receptor.
    Answer by: Baader Web Team (Admin) on May 7, 2017 4:03:00 PM
  68. Rated: 12
    5/21/2017 9:44 AM SolarSpectrum 0.7x Telecompressor 2"
    What is the ideal distance from the back of the 0.7x solar telecompressor lens to the face of the camera chip to give the 0.7x reducing factor? Thanks.

    Answer rated: -6
    The correct distance is 110 mm.
    Answer by: Baader Web Team (Admin) on May 22, 2017 2:44:00 PM
  69. Rated: 12
    8/23/2019 6:55 AM Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)
    Is this prism safe to use with a TeleVue NP127is refractor, which is a Nagler-Petzval design. In addition to the first objective doublet lenses, this has a second doublet at the focuser end of the OTA. Thank you.

    Answer rated: -1
    We do not sell TeleVue-telescopes and are not sure about the design of the lenses.
    So we'd have to ask you to check the manual or consult your TeleVue-dealer. If the telescope can be used for projecting the sun, it can also be used with a Herschel wedge.
    Answer by: Baader Web Team (Admin) on Aug 26, 2019 10:20:00 AM
  70. Rated: 12
    4/21/2020 9:37 AM Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)
    I wanted to know if the Herschel prism is recommended to use it with a D-ERF filter in front of the lens to prevent heat from entering and protect the tube? or the D-ERF is only recommended for use in H & alpha ??

    Answer rated: 1
    Generally you can use the Herschel Wedge on normal refractors without DERF. The DERF is mainly designed as a prefilter for Halpha telescopes. But in case you want or need to keep the heat out of the OTA you can also combine the Herschel Wedge with an DERF
    Answer by: Baader Web Team (Admin) on Apr 21, 2020 9:57:00 AM
  71. Rated: 11
    3/6/2017 9:10 AM Baader 36mm Hyperion Aspheric 2" Eyepiece
    Do you confirm the 72° apparent field of view with 31,75 mm connexion?

    Answer rated: -13
    The 72° apparent field of view can indeed only be confirmed for use with 2" barrel. With 1.25" barrel, the field of fiew is ~58mm. We apologize - we've just noted that this is wrongly stated in our technical data sheet. We will correct this.
    Answer by: Baader Web Team (Admin) on Mar 6, 2017 12:47:00 PM
  72. Rated: 11
    9/3/2017 4:07 AM Baader UHC-S / L-Booster-Filter
    My ZWO filter wheel takes 31mm unmounted filters. Can a 1-1/4" be unmounted and fit?

    Answer rated: 3
    Mounted 1.25" filters have got an external diameter of ca. 31mm *including* the housing, the free aperture is a little bit smaller, as well as the filter glass itself (ca. 28mm). So, it will not work with a 1.25"-filter which was removed from the filter cell.
    But the filterwheel should have a ca. M28.5-thread (the standard 1.25"-filterthread), so that you can insert the mounted filter, anyway.
    Answer by: Baader Web Team (Admin) on Sep 4, 2017 9:45:00 AM
    Answer rated: -11
    Thanks for the detailed answer. Looking back as to why ZWO offered 31mm filters, the reason is the ASI1600 camera I'm using at f2 has vignetting with 1.25 filters. Post will fix that, just preferred 31mm.
    Answer by: David Weiszbrod on Sep 5, 2017 2:27:54 AM
  73. Rated: 11
    2/6/2020 6:32 PM Baader UFC (Universal Filter Changer)
    Ich habe kameraseitig den UFC T2 male Adapter, gibt es auch einen UFC T2 female Adapter um auch ZWO Kameras ohne den Umkehrring anschließen zu können? Oder gibt es dafür eine andere Lösung?

    Answer rated: -2
    Diesen Adapter mit Innengewinde führen wir nicht. Das Außengewinde der Kamera würde sonst in die UFC Basis hinein ragen, der Filterschieber
    somit anstoßen.
    Answer by: Baader Web Team (Admin) on Feb 7, 2020 10:02:00 AM
  74. Rated: 11
    2/1/2019 1:59 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Can you tell me which 2" clamp is appropriate for the Sky-Watcher 8" Flextube SynScan GoTo Collapsible Dobsonian?
    Does this clamp center the accessory relative to the focuser tube?

    Answer rated: 19
    Most likely (we don´t sell SkyWatcher) your clamp is made with a M54x1 thread so our 2956254 will fit. Please unscrew you clamp and check it
    with a caliper or ruler to be sure.
    Answer by: Baader Web Team (Admin) on Feb 4, 2019 9:42:00 AM
  75. Rated: 11
    5/28/2018 5:36 PM Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
    PRISM-2Z 2456117 (2 inch diagonal with zeiss prism) I have a Celestron Evolution 9.25, with 2" visual back. Can I remove the nose piece and screw this diagonal directly onto my 2" visual back and use the lock ring LRING 2458270? Thank you. Jeff

    Answer rated: -2
    Yes this is right when you unscrew the 2" nosepiece a 2" SC thread is released. With the help of the locking ring you´re able to mount
    the diagonal onto the OTA:
    Answer by: Baader Web Team (Admin) on May 29, 2018 9:48:00 AM
  76. Rated: 11
    7/3/2017 4:49 PM Baader Neodymium (Moon & Skyglow) Filter
    Hi I have a Canon 5D modified with the stock IR filter removed making it full spectrum imager. I need a standard 2" threaded IR cut filter to block the unwanted IR while leaving the Ha intact, I could purchase your Baader UV-IR-CUT Filter for this purpose but wonder if the Moon and sky-glow filter would serve dual duty to cut the unwanted IR while also preforming as a LPF with the additional benefit of lunar and Planetary enhancement. Lastly would the Moon and Sky Glow filter degrade deep sky imaging at dark sky locations thus making a case for the need of both filters?

    Answer rated: 2
    The Moon and Skyglow filter can be used as UV/IR blocker, that is correct. And it also has some LPR function (which is of course not as strong as with a full Deep Sky UHC Filter). This means it will degrade the efficiency at dark sky locations not as strong as with a real UHC filter.

    But - it will mean you have:
    -not the maximum deep sky contrast in light polluted areas
    -not the maximum efficiency in really dark areas
    ->therefore separate filters, a UHC and a UV/IR blocker and maybe the Moon&Skyglow for planetary work are the better solution.

    So if imaging efficiency is not your main intention and a compromise is ok you can choose the Moon&Skyglow alone. Otherwise we recommend separate ones.
    Answer by: Baader Web Team (Admin) on Jul 6, 2017 12:26:00 PM
  77. Rated: 11
    6/21/2018 9:18 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Celestron Edge HD 8" SCT and I would like to purchase your #2956100 Baader 2" ClickLock Diagonal Mirror and your #2956220 SC-Clicklock.

    I have a Nikon DSLR and that I use with and without a Focal reducer. What other Clicklock products would I need to purchase?

    Answer rated: 3
    For visual use the ClickLock diagonal and the 2" SC ClickLock clamp is great. According astrophotography you need to go another way
    because the telescope requires a dedicated back focus distance to the camera. Therefore Celestron is offering a special adapter #93644 which is made of two pieces. Without reducer at f/10 the back focus length is 133,35mm, with reducer at f/7 it is 105,0mm. At last you´ll need a matching T2-Adapter for Nikon.
    I know it is less convenient to change accessory but for astrofotography you have to spend more attention that you´ll be successfull.
    Answer by: Baader Web Team (Admin) on Jun 21, 2018 3:05:00 PM
  78. Rated: 11
    7/11/2017 11:29 AM Baader Multipurpose Finder Bracket MQR III 7x50 (max 62mm)
    1. Do you ship to Australia?
    2. Is this bracket similar to the discontinued excellent Celestron 51149A bracket?

    Answer rated: 7
    Distribution for Australia is handled be - they are closer to you and can handle requests faster than we can.

    The MQR do the same as the Celestron bracket, but are of a different, more sturdy design.
    Answer by: Baader Web Team (Admin) on Jul 12, 2017 8:21:00 AM
  79. Rated: 11
    1/28/2017 2:27 PM Baader ClickLock Eyepiece Clamp 1¼" with built in diopter-adjustment (T-2 part #08)
    Which clickstop adapters are suitable to upgrade mark v bino eyepiece holders?

    Answer rated: -4
    The Clicklocks work similar to our #2458100, but they are not the same, and you can not replace them yourself. The Clicklock for the right and for the left eyepiece move in opposite directions, and much mor important: It is tricky to mount the eyepiece clamps perfectly adjusted and aligned. This is not possible to do with simple means, so we do not offer the parts needed to do it on your own. The chances are very high that you will see double images if you replace the eyepiece clamps in your own.

    But we can upgrade the binos in our optical lab, so that they will not lose their collimation. Please use the contact form at the bottom of the page to send us an email; we cannot offer this service in our webshop.
    Answer by: Baader Web Team (Admin) on Jan 30, 2017 11:16:00 AM
  80. Rated: 11
    7/30/2018 4:37 AM Bundle: Hyperion Universal Zoom Mark IV with Hyperion-Barlow 2.25x (8-24mm / 3.6-10.7mm)
    do you have an adapter that will attach Mark 4 zoom to a Sony FDR AX53 movie camera? It provides a 55mm filter thread to attach to the camera.
    Thanks Jamie Pauley purchasing through Adorama in the US.

    Answer rated: 9
    To attach a camera with 55mm Filter thread, you need
    Baader Hyperion Zoom M43 / SP54 Adapter # 2958086
    Baader Hyperion DT-Ring SP54/M55 for DT Adapter II&III and Hyperion Eyepieces # 2958055

    Answer by: Baader Web Team (Admin) on Jul 30, 2018 8:56:00 AM
  81. Rated: 11
    12/28/2018 11:08 PM Baader Multi-Purpose Vario Finder 10x60 (single or with MQR-IV finder holder)
    The version of the 10x60 finder witth MQR IV finder holder, does it include an EQ dovetail as well?

    Answer rated: -2
    A dovetail is only included in the version without MQRI V holder
    Answer by: Baader Web Team (Admin) on Jan 3, 2019 12:21:00 PM
  82. Rated: 10
    5/17/2019 9:48 PM Baader Hyperion 68° Eyepiece Set (Starter)
    The recommended distance from the m43 thread on the eyepiece to the sensor on a APS-C DSLR camera is T-Adapter(7.5mm) + 30mm extension + T2-ring(55mm flange-back). By using a 40mm extension instead of a 30mm I get more magnification, but what's most important when doing photography is to minimize the abberations/lense errors as much as possible. Which distance is best for this? 40mm extension or 30 mm extenion?

    Answer rated: -3
    This is an empiric value. You need 40mm of distance to get rid of the distortions at the edges with a full-frame-camera; for APS-C, 30mm are sufficient.

    We did not notice obvious influences on the image quality by increasing the distance/magnifications, only the exposure times get longer when you increase the distance. Of course, if you are close to the resolution limits of the optical system, too much magnification is not helpful, but but as long as you don't exceed the resolution power of your telescope, it should not matter whether you use 30 or 40mm with APS-C.
    Answer by: Baader Web Team (Admin) on May 20, 2019 8:26:00 AM
  83. Rated: 10
    2/26/2017 3:55 PM Baader Filterbox, stackable on all sides
    What material are these boxes? Does the material become brittle, or easily broken in very low or freezing temperatures (e.g. -20 or -30 degrees C)?

    Answer rated: -5
    Sorry, these boxes are not meant to be subjected to temperatures of -20° or -30°C.
    The plastic material indeed will become brittle.
    Answer by: Baader Web Team (Admin) on Feb 27, 2017 8:42:00 AM
  84. Rated: 10
    12/23/2020 2:37 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Celestron Nexstar Nevolution 9.25. What click lock works with it?

    Answer rated: 1
    You need #2956220 SC / HD (2")-Clicklock (5" SC, 6" SC/HD, 8" SC/HD and 9¼" SC) for a regular Schmidt-Cassegrain.
    Answer by: Baader Web Team (Admin) on Dec 29, 2020 10:49:00 AM
  85. Rated: 10
    6/24/2020 2:36 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Since I have recently bought a 2" telescope, I am looking to add 2" (not 1.25" eyepieces) eyepieces.
    In appearance, the baader hyperion selection look like 2" with a 1.25" projection added on.
    My question: Are these eyepieces, basically 1.25" made usuable in 2" telescopes? Or 2" eyepieces with a 1.25 projection added on?

    Answer rated: 3
    Your first assumption is correct. They are, like most of our other eyepieces, in fact 1.25" eyepieces which can be used for 2" as well. The only "true" 2" eyepieces we currently sell are our Hyperion Asphercic 31mm and 36mm:
    Answer by: Baader Web Team (Admin) on Jun 24, 2020 7:50:00 AM
  86. Rated: 10
    9/25/2017 10:44 AM RCC I, Rowe Coma Corrector
    Please can you explain the differences between this and RCC and MPCC correctors?

    Answer rated: 10
    Both MPCC III and RCC offer a similar quality (with the RCC being maybe a little bit better than the MPCC Mark III), but the MPCC is designed to work out of the box with a DSLR (that is, 55mm with a T-2-adaptation), while the RCC provides much more backfocus for e.g. a filter wheel or the RCC Off-Axis Guider. So, if you need more space for accessories, then the RCC is the right choice. If you either wan't to adapt only camera, or if you also want to use eyepieces, the MPCC III is better suited.
    Answer by: Baader Web Team (Admin) on Sep 25, 2017 11:26:00 AM
  87. Rated: 10
    4/7/2018 6:06 PM 2" BDS-NT Baader Diamond Steeltrack® Focuser
    Hi, I would like to purchase a Baader Diamond SteelDrive System Without Hand Control, part number 2957152 plus a Baader 2 Inch Diamond Steeltrack NT Focuser, part number 2957230. Can you tell me if this set up would fit a Skywatcher Newtonian 200p and then controlled through a laptop using Sequence generator pro without the hand controller.
    Hope you can help,
    Kind regards,
    Phil Rees

    Answer rated: -4
    The SteelDrive can be assembled to all kind of our BDS SteelTrack (NT, RT, SC). So far the SteelDrive isn´t available yet, also we cannot
    tell if//when the programmers from Sequence Generator will support it.
    Answer by: Baader Web Team (Admin) on Apr 10, 2018 9:24:00 AM
  88. Rated: 10
    8/9/2019 12:22 PM Baader Ultra Narrowband O-III CCD-Filter (4,5nm)
    A few days ago I acquired an OIII filter 4.5 nm 31mm and after trying it the halos it generates are horrible.
    Why does this happen if the specifications ensure that they do NOT produce halos?

    Answer rated: -3
    Your oiii 4.5nm filter creates terrible halos even around not-so-bright stars. Writing articles and saying that this is not a problem is not correct on your part, as a world-famous company. Do not consider your customers idiots, we use similar products and know what the result should be. If your filter on 7nm does not give halos, then they are not at all, without any conditions. And OIII 4.5nm turned out to be frankly bad. If I had the opportunity, I would gladly return the money.
    Answer by: Dmitry Podorozhko on Feb 13, 2020 5:56:22 PM
    Answer rated: -6
    In the moment when you install our filters in between your camera, the flattener/reducer, Coma corrector, telescope, it becomes part of this unique optical system. And each optical system is different because many items from different manufacturers are involved. All optical surfaces interact with each other in certain ways. One way is that coatings are reflecting unwanted light away. When there is no other surface that reflects the light back - then its perfect, no halos can occur. This is what we mean with "the filter does not produce halos". He does not produce the halos by its own, inside of the filter. But in the moment when other surfaces are close to the filter, it is possible that light gets reflected back by one of these surface and halos occur.
    Because there are so many combinations of camera (windows), flatteners, correctors a.s.o. possible, it may happen in that in some unlucky cases even "halo free" filters are involved in the halo production - but not guilty by themself. We know from customer that the windows in front of the chips of certain camera models are more likely to generate halos than other cameras. And some cheaper flatteners/reducers/correctors are also more often involved in the problem.
    You can try to turn around the filter, it may be by chance that the reflection of different wavelength from the other side reduces the halo. Or - if anyway possible - bring more space in between filter and the other surfaces that are reflecting. That makes the halos bigger, less bright, and sometimes they disappear.
    BUT: Are halos really terrible? If - for example - you make a photo of Horsehead Nebulae with filters, its impossible to get it without halos because the extremely bright star in the field. This fact and this appearance of the object is widely accepted - and it doesn´t look worse than the spikes of the spider of a Newtonian.
    Please also read here:
    Even photos from professional Observatories show halos because its unavoidable. And nobody cares.
    If you send us your photo with halo and detailled informations about the setup (camera, reducer, flattener, corrector, filter, telescope) then we can help you to find the source for the halo - but most likely you cannot get rid of it, only with image processing tricks.
    Answer by: Baader Web Team (Admin) on Aug 9, 2019 12:33:00 PM
  89. Rated: 10
    11/10/2018 12:25 AM Baader f/2 Highspeed-Filterset H-alpha / OIII / SII
    When will 2" filters will be in stock?

    Answer rated: 1
    Unfortunately it is very often hard to predict delivery times of items. Therefore we have installed an "Notify" function on the pages of products wich are currently out of stock. Please use this function to become informations as soon as they are available.
    Answer by: Baader Web Team (Admin) on Nov 12, 2018 8:33:00 AM
    Answer rated: 0
    Some stores talk about March 2019. Is it the real delay?
    Answer by: Jean-Pierre Berger on Nov 20, 2018 4:11:03 AM
  90. Rated: 10
    1/26/2017 3:39 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Can you recommend a reducer to use with Mk IV zoom? I want to reduce the magnification min/max range ... THX

    Answer rated: 9
    You can increase the max. magnification with the Hyperion Barlow. The combination of Mark IV and Barlow results in focal lenghts from 3,6 - 10,7
    To reduce the focal length of your telescope however, in order to increase the field of view (= less magnification) is more difficult. A reducer has to be calculated to optically match your telescope brand and model, otherwise you may not be able to reach focus and the image quality might be horrible, with an enormous amount of field curvature and/or spherical aberration

    Unfortunately reducers are not our speciality, since we only offer reducers for very few such special optics. Also please note that the reducers that we do offer (such as the Alan Gee Telecompressor #2454400 - calculated for C8 or higher Schmidt-Cassegrains) are all mainly optimized for photography and cannot be used in combination with prism or mirror diagonals since the optical backfockus just is not enough.

    Sorry, this is quite a complex area. For this reason we never offered a "universal" reducer for lowering magnification during visual observation.
    Answer by: Baader Web Team (Admin) on Jan 26, 2017 4:31:00 PM
  91. Rated: 10
    7/20/2017 4:55 PM Mark V Großfeld (Giant)-Binocular
    Good evening, I just bought a Mark V. The two rings left side solidarity, it is not possible to adjust the diopter on this side? Is this normal?
    In addition, on the right side, there is a small opening about 15 ° at the bottom of the right eyepiece tube. A little external light penetrates into the right tube. Is that also normal?

    Answer rated: -4
    The locking rings move in opposite directions (one clockwise, one couterclockwise) - but both have a diopter adjustment and a clicklock, so you should be able to rotate both rings.

    Iy fou are talking about the whole close to the bridge, which is closed when you move both parts of the binoviewer to the closest pupil distance: This is normal and necessary to adjust the interpupillar distance; but intruding light is no problem.
    Answer by: Baader Web Team (Admin) on Jul 24, 2017 11:03:00 AM
  92. Rated: 10
    8/2/2017 10:07 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    How do I get the new universal zoom Mark IV 8-24mm eye piece to focus at infinity on the Celestron Regal M2 100ED?

    Answer rated: -25
    This is described on page 5 and 7 of the manual (PDF: ).
    You need to replace the telescope ring B with spotting scope ring A, this will give 4 mm more back focus. Then you have to push the eyepiece into the eyepiece clamp as far as possible; you may have to give it some mure pushes because the locking collar of the spotting scope moves when you turn it.
    Answer by: Baader Web Team (Admin) on Aug 2, 2017 10:26:00 AM
  93. Rated: 10
    2/10/2017 7:21 AM Telecentric System TZ-4 (4x focal length)
    Can the Baader Telecentric lenses be used like ordinary Barlows, e.g. for visual observation or imaging (from UV to IR) of the planets?

    Answer rated: 10
    A Telecentric is not a Barlow, although it also affects the focal ratio. Its main purpose is to produce a beam of parallel light for H-alpha-filters. The change of the focal ratio is only a side effect.

    Because they are made for H-apha-filters, they are designed for 656.3 nm (the red H-alpha-light); only the TZ3 is also designed to work at 396 nm very good, although then the focal plane is shifted for ca. 5mm.

    For visual observations in other parts of the visual spectrum, you need a Barlow, not a Telecentric.
    Answer by: Baader Web Team (Admin) on Feb 13, 2017 9:24:00 AM
  94. Rated: 9
    1/7/2019 2:11 PM Baader Neodymium (Moon & Skyglow) Filter
    Can this product be used on an unmodified sony a7r3? Do you offer any 'clip-in' options?

    Answer rated: 0
    Yes, this filter can also be used with unmodified cameras as well as for visual use.
    We do not have a clip-filter solution, but you can mount any 2" filters in front of a lens. This works for lenses with focal lengths of ca. 80mm and longer; for wide-angle-lenses, astronomical filters work not so good at the edges of the field of view.

    To mount a 2" filter in front of a camera lens, you need
    Baader DSLR-2" Filter Holder M48/SP54 # 2408166
    plus adapters from the SP54-thread to the filter thread of you camera. These are:
    Hyperion DT-rings #2958028 - #2458062 and additional Stepper Rings M67 up to M82
    Answer by: Baader Web Team (Admin) on Jan 7, 2019 3:18:00 PM
  95. Rated: 9
    9/9/2016 1:29 AM Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp
    Are the BBHS coatings easy to clean? Do the coatings have a life comparable to your dielectric coatings? Do the coatings degrade over time and at what rate? Is there a difference in performance between your dielectric diagonal and the BBHS one, what are the differences and are they significant or very slight? I own an early Televue APO 4 inch refractor.

    Answer rated: -34
    BBHS-mirror coatings require the same care during cleaning as you would give to the protected aluminum-coatings of a Newtonian telescope. Only dielectric coatings have the ultimate hardness to withstand any kind of mistreatment during a cleaning procedure - very similar to our Phantom-Group hard antireflection coatings applied onto our lens surfaces.

    Any reflecting telescope with classic coatings can attain a lifetime of 20 or 30 years - correct handling provided. The same accounts for our protected silver-coatings, whereas the position of a stardiagonal within the optical train does provide much better protection against environmental influences, compared to the exposed surface of a primary telescope mirror.

    We do regard the benefit of the BBHS hardsilver coating to be quite noticeable, compared to the reduced spectral range offered by a dielectric coating. Please check in the Internet for statements that would verify our position. Or look for the very extensive tests on star diagonals, performed by William Paolini (see tab "Downloads".

    Please read more on the properties of our star diagonals and our design philosophy here:
    Answer by: Baader Web Team (Admin) on Sep 15, 2016 8:22:00 AM
  96. Rated: 9
    3/25/2017 8:38 PM Baader 2"/90° Astro Amici-Prism with BBHS ® coating
    What advantage does the amici have over the roof prism? Which is better for astronomy? which is better for terrestial?

    Answer rated: 3
    In Europe the roof-prism was invented by an Italian calles "Amici" - thats why its called Amici-Prism here. The difference lies in the quality: the extreme accuracy of the roof edge and roof surfaces. Most roof prisms are only made precise enough for low mag terrestrial viewing. Otherwise the production cost would get too high.

    The amici/roof prisms that we supply with the BBHS-coating all are made according to the original optical specifications by Carl Zeiss. This is the reason for the high optical quality - good enough for high magnification work ( - and for the price as well).
    Answer by: Baader Web Team (Admin) on Mar 27, 2017 9:07:00 AM
  97. Rated: 9
    7/1/2020 11:40 PM Baader Ultra-Narrowband H-alpha 3,5nm Filter
    Can this filter be used as an internal energy rejection filter for H-alpha solar observation on 140mm and 60mm refractors? The ERF would be placed in front of the diagonal mirror, and the etalon behind the diagonal.

    What is the filter's throughput beyond 1000nm?

    Answer rated: 5
    We do NOT recommend this! No filter near focus can replace a front end blocker - as 100% of solar energy hit the filter close in front of the focus position. Front end energy blocking is mandatory for H-alpha work - but not so for white light work.

    Why - because in white light you could use a Herschel Wedge Prism to throw away 95.4 % of ALL entering energy - before it even reaches the first neutral density filter or dielectric continuum filter.

    This is not possible on H-alpha - you need 100% of the H-alpha wavelength, but preferably zero of anything else. so - in theory - you can do this as you describe - but the filter at that heating point can break on you any second.

    Also - all photographic narrowband filters ought to be fully blocked OD 4.0 from 390 nm to 1150 nm - as this is the sensitivity range of almost all CCD/CMOS-chips (most filter suppliers though do not show their blocking efficacy above 700 nm....).

    So the 3.5nm H-alpha-filter is surely blocked to 1150 nm - but our front end D-ERF-filters are blocked to 1450 nm - exactly to provide perfect solar safety. Above 1400 nm most optics do not pass IR anyhow.
    Answer by: Baader Web Team (Admin) on Jul 2, 2020 7:47:00 AM
  98. Rated: 9
    2/17/2020 5:30 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Celestron EdgeHD 800 8" SCT and have #2956220 SC / HD (2") - Clicklock.

    Which T Adapter and fully pushes into ClickLock and provides the correct optical path length to use with a Nikon T Mount DSLR?

    Answer rated: 6
    We don´t have a dedicated solution for your request. With the following Items you can get an adaption for your purpose:
    The finetuning ring works as an extender and with the stop ring you can fix the length you need. We recommend using a vernier caliper so you can
    set it to the length of your demand. Please hold in mind that the 2" SC thread from OTA is 10mm long and therefore the optical length of the ClickLock
    is decreasing from 47mm to 37mm.
    Answer by: Baader Web Team (Admin) on Feb 18, 2020 11:11:00 AM
  99. Rated: 9
    11/12/2019 1:20 AM Baader UFC (Universal Filter Changer)
    Will your new upcoming RASA 8 adapter be compatible with 17mm back-focus cameras? Will there be tilt adjustment available for these types of cameras?

    Answer rated: 8
    Yes, this latest addition of the UFC-family - the new RASA 8 / S70 UFC-Adapter (#2459136) which will launch on our website very soon - is compatible with 17 mm back-focus cameras such as ATIK Horizon. The UFC allows to change any kind of filter from 1 1/4" up to 50x50 mm square in front of the RASA 8.

    The only function, that still might be left to desire, is an easier way to reach the front adjustment hex-screws of the RASA 8. Due to the very short backfocus available, it is somewhat difficult to reach these screws and to "tweak" the star sizes in each corner of the image to absolute perfectness.

    So - in order to even reach this goal (exchange filters AND effortlessly adjust the camera tilt), in February latest we will launch a separate product - only produced for the RASA 8: the FCCT (Filter Changer & Camera Tilter). This unit will feature 3D-printed filter sliders and be only able to accept filters in diameters of 31 mm / 36 mm / and 2"(47.4 mm) w/o cell mount. This is a revolution for the RASA 8 since it makes perfect adjustment of all stars in the field a joy. Already now the first imagers are using this solution as prototypes and the results are outstanding, see here:
    Answer by: Baader Web Team (Admin) on Nov 13, 2019 4:00:00 PM
    Answer rated: 8
    The RASA 8" UFC-Adapter is now available:
    Answer by: Baader Web Team (Admin) on Nov 19, 2019 11:42:00 AM
  100. Rated: 9
    9/30/2018 4:18 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    Is this eyepiece parafocal as you move between click stops?

    Answer rated: -6
    We recommend that you focus at high power and then zoom out. Usually, you do not have to adjust the focus then, or only a little bit - this depends also on the possibility of your eyes for accomodation. In any way, there will not much refocussing be necessary - usually it's only the testing to see if you really have already achieved the best focus.
    Answer by: Baader Web Team (Admin) on Oct 1, 2018 9:18:00 AM
  101. Rated: 9
    4/16/2018 8:31 PM Baader Sky Surfer V illuminated finder
    Will the DSLR hot-shoe adapter that works with the Sky-surfer III, work with the Sky-surfer V? If not, where can I obtain a hot-shoe adapter for the Baader Sky-surfer V?
    Thanks for any information.

    Answer rated: -15
    You cannot mount the SkySurfer V on the hot-shoe which can take the SkySurfer III. We don´t know a solution for it but fear that the big
    SkySurfer V couldbe too heavy for it and may damage the camera body.
    Answer by: Baader Web Team (Admin) on Apr 17, 2018 4:53:00 PM
  102. Rated: 9
    10/15/2017 4:27 AM Baader H-alpha 7nm CCD Narrowband-Filter
    I have a non-modified Pentax K-1 DSLR camera. At the end of my t-ring is a 2" nose that accepts 2" threaded filters. Can I use this successfully for narrowband/Ha imaging on an unmodified Pentax K-1 DSLR camera with good results? I'm not expecting results as good as on a modified camera, but on an unmodified one is there at least some improvement when using this Ha filter and if so, how much? Please help. Thank you.

    Answer rated: -12
    You will see some improvement even with an unmodified camera. But be aware that the exposure time goes up
    very much when you only collect Halpha light
    Answer by: Baader Web Team (Admin) on Oct 19, 2017 2:31:00 PM
  103. Rated: 9
    11/25/2016 1:32 PM
    Will this clamp fit a Zeiss Telementor dovetail? I wish to fit my telescope to an Ioptron Mini Tower. Many thanks.

    Answer rated: -2
    Unfortunately not. Such a norm is only produced by Astro Physics anymore: DOVE 08
    Answer by: Baader Web Team (Admin) on Nov 28, 2016 9:06:00 AM
  104. Rated: 9
    8/22/2019 5:31 PM Baader Focusing Eyepiece Holder 1¼" / T-2 (T-2 part #08A)
    The specifications state 5mm of travel; how far does the focus ring turn to produce this 5mm? 1/4 turn? Full turn?

    Answer rated: 1
    It takes about 2 turns for 5 mm of travel.
    Answer by: Baader Web Team (Admin) on Aug 26, 2019 10:17:00 AM
  105. Rated: 9
    3/18/2019 10:15 AM Baader DSLR-2" Filter Holder M48/SP54
    Could you please tell me what products I would need to fit a 2" filter to my Nikon P1000 camera whose lens has may carry a 77 mm filter? Which is also the best solar filter for this camera for taking picture of the sun?

    Answer rated: 0
    You will need following two rings to step-up M77 from the filter-holder

    Please take a look at this table to find out what AstroSolar filter fits best on your lense:
    More about solar filters are here:
    Answer by: Baader Web Team (Admin) on Mar 18, 2019 3:40:00 PM
  106. Rated: 9
    9/2/2019 11:46 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    With eyepiece projection, the image at the edge is extremely blurred. What could be the reason for this?

    Answer rated: 22
    For eyepiece projection with our Morpheus and Hyperion (zoom) eyepieces, we recommend a distance between eyepiece and T-ring of 40 mm on full-frame cameras, in addition to the 55 mm that were the flange focal distance of all "SLR" and DSLR camera bodies for decades when a T-ring was placed in front. Only with a T-ring that maintains this distance can old lenses with a T-thread deliver sharp images. Therefore, it has been tried to take this distance into account in all designs, because this is the only way to ensure that the sharpness performance is optimal. Of course, all this is only valid to a limited extent today - because the DSLR standard is losing it importance and the term „T-ring“ is all too often reduced to the mechanical thread and not the correct distances. In our brochure on digiscopy, we have therefore stated the back focal distance of 55mm. With a DSLR (full frame or APS-C), this distance is also maintained in good approximation with modern, narrow T-rings, which are intended for use on telescopes, where every millimetre often has to be haggled. For Micro Fourthirds cameras, for example, we have a special adapter that allows both an adaptation with the 55mm standard support dimension and a much shorter adaptation.

    Mirrorless system cameras have a much shorter back focal distance than comparatively large SLR cameras. The available T-adapters are usually for use with telescopes with a moving focuser. Here the shorter back focal distance must be compensated by additional extension sleeves, if a certain distance has to be kept.

    The example adaptations in our digiscoping brochure thus apply to all T-adapters that follow the T2 standard and deliver a back focal distance of 55mm.
    The indicated distances of
    min. 40mm spacer sleeve plus 55mm T-2 flange focal distance for full format
    min. 30mm spacer sleeve plus 55mm T-2 flange focal distance for APS-C
    min. 15mm spacer sleeve plus 55mm T-2 flange focal distance for MFT
    were empirically determined (Canon full format, Nikon APS-C (slightly larger sensor than Canon APS-C), Panasonic MFT) and are the values at which the image looked good, i.e. no (disturbing) distortion could be detected in nature photography. However, only the Hyperion Zoom without Barlow lens was used. For decades, we had in principle recommended the 40mm extension; with the smaller sensors, shorter distances (and less magnification) are also possible. The overall length of an adapter ring from the M43 eyepiece thread to T-2 was neglected, or it was regarded as part of the eyepiece.

    With shorter overall distances than indicated above, the sharpness in the edges is catastrophic. Only with these distances the image is enlarged in such a way that the entire sensor can be used.

    When working with an additional Barlow lens for even more magnification, the resulting effective focal length increases extremely and the system becomes more difficult to control. The thick stack of lenses does not make the image any better, and the telescope opening must provide sufficient resolution, also in relation to the pixel size of the camera. For highest magnifications we therefore recommend the FFC instead of the eyepiece projection in combination with a barlow lens – more on this below.

    What can easily be overlooked is that, depending on the camera type and the telescope aperture ratio, a more or less pronounced vignetting is unavoidable.

    We regret that we can’t give a binding (or universal) recommendation for an eyepiece-Barlow-lens-combination - for no single eyepiece on the market - where vignetting does not occur. Eyepiece projection is basically a compromise and has been "invented" for planetary photography since the beginning of all photography in order to be able to image a small object in the center of the image with excellent sharpness and very long focal length. The further development of the eyepiece also made it possible to enlarge the usable image area - however, this method is still a compromise. We therefore do not claim that you can achieve perfect sharpness over the entire image field with an eyepiece and a Barlow lens. We also do not claim that you can achieve a completely unvignetted image field!

    For exactly this reason - because there has been no solution from anyone in the world (and still is not) - we asked Carl Zeiss-Jena in 1990 to calculate for us a plano barlow lens of any complexity for medium format cameras. Ultimately, this was only possible with two additional crystal substrates made of genuine calcium fluorite (not comparable to simple ED glass). For the Baader Fluorite Flatfield Converter (FFC) Barlow - which can produce an image circle of 90 mm from 4x to 8x - an aperture ratio of 1:10 - as is the case with many refractors - was the basis for calculation at that time. The 90 mm image circle was due to the fact that the famous "PENTAX 6x7" medium format camera was available at the time - with a 90 mm image diagonal.

    To this day, this FFC converter lens system is "the sharpest of all Barlow lenses" in the world. And since the full 42mm format uses less than half of the FFC’s 90mm image circle, the FFC works so well even at an aperture ratio of f/5 that it delivers diffraction-limited sharpness even with CMOS chips with ~ 4my pixel size (if the telescope optics and seeing are good enough). However, this only works so well due to the large image distance. If you are looking at the "Baader FFC-Barlow", you will see that the image distance has to be varied between 80 and 150 mm (or even more). So you pay for the excellent optical performance with a very long mechanical construction. Without an excellently stable focuser, this can only cause frustration. Anyhow - You will surely find enough judgments which testify that there is no other projection lens system with sharper - and not vignetting - imaging.

    So if photography with very long focal lengths is your main focus, then you would have to replace the combination of the eyepiece with a 2.25x Barlow for a FFC - in addition to the armada of extension rings, which are necessary if you want to use this projection method without mechanical distortion.
    Answer by: Baader Web Team (Admin) on Sep 2, 2019 11:47:00 AM
  107. Rated: 9
    11/21/2018 8:30 PM Baader L-RGB CCD-Filterset
    So your saying the 36mm filter glass thickness is 4mm while other dealers say 2mm 3mm 4mm whos correct?

    Answer rated: 16
    All filters with 1,25" and 2" have 2mm, only UBVRI have 4mm
    Answer by: Baader Web Team (Admin) on Nov 23, 2018 4:24:00 PM
  108. Rated: 9
    4/26/2020 12:23 AM Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)
    Could you please let me know how to use this prism in conjuntion with 1.25" double stack cotinuum + polarizing filter + Maxbright II binos?. Thanks in advance.

    Answer rated: -3
    The basic adaption of our bino-viewers is by replacing the 2" ClickLock of the Herschel with
    Baader Adapter 2" (male) / T-2 (male) # 1508035
    Then you have a T-2-thread, onto which you can mount the binoviewer or the T-2 QuickChanger as described in the manual (page 18 in the manual of the MaxBright II); the 2"-filters of the Herschel wedge fit into the 2"/T-2 adapter. We recommend a T-2 quickhanger, so that you can insert the glasspath correctors for T-2 into the binoviewer; be careful with the 2.6x gpc as it may hit the filters in the Herschel.

    By using the T-2-connection, you can also use
    Baader T-2 Conversion Ring # 2958110 plus
    Baader Double T-Filterholder 1¼" # 1508030
    to mount a 1.25" filter in front of the binoviewer. Again, this may be problematic with the 2.5x gpc as it faces towards the telescope and not into the binoviewer, so make sure that you have enough backfocus.

    Installing a single polarizing filter is tricky, as you can't rotate the binoviewer as easily as an eyepiece. There should be enough place to mount the filter in front of the double stack and use the T-2 quickchanger to access it for adjusting the brightness.
    Answer by: Baader Web Team (Admin) on Apr 28, 2020 12:18:00 PM
  109. Rated: 9
    4/27/2020 7:47 PM Baader 36mm Hyperion Aspheric 2" Eyepiece
    Is this eyepiece compatible with a Celestron C8HD? An astronomer told me that this piece may not be a good choice for the C8HD's internal corrector.

    Answer rated: -5
    So far, we had no complaints about the EdgeHD and the Hyperion eyepieces. On the contrary, we are often surprised how non-problematic these optical systems are, as many photographers use the telescope with an additional focuser and thus place the camera at wrong distances, and are still happy with the results.

    So, after all that we have seen or heard, there is no problem, and we can – and do – recommend them for the EdgeHD, too.
    Answer by: Baader Web Team (Admin) on Apr 28, 2020 10:05:00 AM
  110. Rated: 9
    5/5/2019 2:48 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Are you thinking about making a 70mm (71mm?) Clicklock nosepiece for Planewave telescopes?

    Answer rated: 8
    For Planewave Telescopes we suggest our M68/Securefit Adapter #1323840, which can be mounted directly to Hedrick/IR90 Focusers OR to the Securefit extensions.

    Then you can use our M68 Clicklock #2956268. Make sure you have enough backfocus after the ClickLock. Old 17" and current 20" do not allow for the ClickLock and 2" Diagonal. You wont reach focus.
    If you need NO 2" Diagonal you may need M68 Extensions. In this case we suggest our M68 Adapterset for Planewave which includes various Extensions and the Planewave Adapter.
    Answer by: Baader Web Team (Admin) on May 6, 2019 8:15:00 AM
  111. Rated: 9
    1/4/2020 1:54 PM Baader Neodymium (Moon & Skyglow) Filter
    Waqas already asked similar but few years have passed. I've noticed you have a kind of universal adapter. Basically I want to use this filter with as many lenses I can. But you've stated the thread here is a telescope thread. How should I go about using the filter with my camera lenses? I have step up and down rings from the 80s to the 40s in mm but i suspect they're useless for this thread.

    Answer rated: 6
    The answer provided to the other question is still valid. The most important adapter to use our 2" Filters with camera lenses is our DSLR-2" Filter Holder M48/SP54 (#2408166).
    Based from the SP54 thread, we have lots of Step Up- and Down Adapters, our "Hyperion DT-Rings".

    Please check out also our detailed PDF on Digiscoping:
    Answer by: Baader Web Team (Admin) on Jan 7, 2020 10:52:00 AM
  112. Rated: 9
    1/6/2020 8:42 PM Baader U-Venus-Filter (350nm)
    What adapter would be needed to have the 2" UV filter work on a 72mm SIGMA 18-300mm lens?

    Answer rated: -5
    Assuming that 72mm is the filter thread size of the objective lens, you will need the following combination of adapters:
    #2408166: Baader DSLR-2" Filter Holder M48/SP54
    #2958062: Baader Hyperion DT-Ring SP54/M62
    #2958072: Baader Hyperion Stepper-Ring M62 onto M72

    Please check out also our "DIGISCOPING"-Brochure with many more information:
    Answer by: Baader Web Team (Admin) on Jan 7, 2020 10:20:00 AM
  113. Rated: 9
    1/10/2020 7:43 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    I have a Nikon D7100. Which adapter do I need to connect the Hyperion Universal Zoom Mark IV, 8-24mm eyepiece to the camera directly (I already have a T-Ring adapter for Nikon). I purchased the Hyperion M43 and DT-Ring DP54 as suggested in the picture with no luck

    Answer rated: 11
    The SP54-thread is inteded to make a connection to the filter thread of a camera lens.

    To attach the camera body directly, you need the Hyperion / Morpheus® T-Adapter M43/T-2 # 2958080

    In addition, you should add two T-2 / 15 mm Extension Tube # 1508154 for an APS-C-camera like the D7100 or one T-2 / 40 mm Extension Tube # 1508153 for full-frame-cameras. Otherwise, the sensor will be too close to the eyepiece, and there will be distortions at the edge of the image.

    Please take a look at the following PDF, where we describe all possible adaptations to the eyepieces:
    Answer by: Baader Web Team (Admin) on Jan 22, 2020 3:38:00 PM
  114. Rated: 9
    6/5/2020 2:22 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    What do I need to connect my SBIG ST-8300M to my CPC800XLT SCT? What will be the back focus of the ClickLock system?

    Answer rated: 11
    For the C925, you can use Baader 2" ClickLock SCL (3.3") clamp (C9¼" - C14") #2956233
    to use any camera with a 2" nosepiece. It has got a length of 40mm. The ideal backfocus of a Schmidt-Cassegrain is about 5" (a little bit omre for the C925, see
    So, to use it the perfect distance, you may want to get closer to this with an extension like Baader 2" ClickLock 47 mm extension #2956247 or some other extension tubes. But you'll reach focus without the extension, too.

    Celestron provides a T-adapter to SC which gives you the right distance, but it uses only the T-thread (M42x0.75) and will cause vignetting on a full-frame sensor (and is also calculated for a DSLR with 55mm flange distance.
    Answer by: Baader Web Team (Admin) on Jun 5, 2020 3:00:00 PM
  115. Rated: 9
    5/17/2019 6:24 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    i have a C8 edge hd 8" sct with baader 2" click lock and I would like to use my nikon d5300 with an adapter, with which to use a filter without using the UFC. What could I buy?

    Answer rated: -5
    The 8" EdgeHD has got a backfocus of 133mm, the SC-Clicklock is 47mm long.
    For an APS-C-camera, you can use T-2-adapters without problems and don't need a larger diameter for the adapters. So, you can use the standard T-ring, which gives you 55mm backfocus for the DSLR.

    To adapt the APS-C-camera to the 8" EdgeHD with a Clicklock, we'd recommend
    - 1x T-Ring Nikon to T-2 # 2408300 (55mm backfocus to the camera sensor)
    - 1x Baader VariLock 29, lockable T-2 ExtensionTube 20-29mm with spanner tool, set to 28.5mm, # 2956929
    - 1x Baader 2" / T-2 Nose Piece and Camera adapter # 2408150 (total length 2,5mm)
    - 1x 2" Clicklock #2956220 (length 47mm, you already have this part)

    This gives you a total length of 133mm without a filter.

    You can screw any filter with a 2" housing into the 2" nosepiece (just like into any eyepiece). The filter will move the focus outwards by ca. 1/3 of its thickness, so a 2mm filter will move the focus about 0.7mm outwards. If you set the Varilock to 29mm, you are within the 8" EdgeHD's specified working distance of 133.35 +/-0.5mm.

    A full-frame camera would require a Wide-T-Ring to make use of the full aperture; for the smallet APS-C, the T-2-combination works fine.
    Answer by: Baader Web Team (Admin) on May 20, 2019 9:07:00 AM
  116. Rated: 8
    12/17/2020 10:45 AM sCMOS range: Balor, Marana, Zyla and Neo cameras for Physics & Astronomy
    Have they updated their cameras to be compatible with already existing software or are they still requiring you to use their proprietary software?

    Answer rated: -3
    Information on the required software can be found on the spec sheets of the cameras. There you can see that Andor offers

    i) Andor SOLIS for imaging (our own software for data acquisition and processing)

    ii) Andor SDK and Andor SDK3 – which is a software development kit that allows you to control the Andor camera from your own application. Available as 64-bit libraries for Windows (8, 8.1 and 10) and Linux. Compatible with C/C++, LabView and Matlab (Python also possible).

    Andor also offer drivers to use the camera with third party software like MaximDL. They are currently updating our “Third party software support” website.
    Answer by: Baader Web Team (Admin) on Dec 17, 2020 10:48:00 AM
  117. Rated: 8
    9/18/2017 8:33 AM 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons)
    Please tell me how can I connect the 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons) and the camera QHY 163m. Is there any ready-made solutions. If not, how to calculate the adapter? Thank you.

    Answer rated: 3
    it is quite hard to find data about the back-focus of the QHY 163M camera as their manual is not online, but it seems to be 18mm. The MPCC is designed for a distance of 55mm +/-1mm between its T-2-thread and the sensor, so you need a spacer with a length of 37mm.
    You can achieve this easily with the
    Baader VariLock 46, lockable T-2 ExtensionTube 29-46mm with spanner tool (T-2 part #25V) #2956946 ( )
    Please check the camera manual if the back-focus measured from the T-2-thread is 18mm. If it is different, you can use either the Varilock 46 (for 29-46mm) or the VariLock 29 (for 20-29mm).
    Answer by: Baader Web Team (Admin) on Sep 18, 2017 8:35:00 AM
  118. Rated: 8
    7/19/2019 2:47 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Celestron Edge HD 8 and I am looking to upgrade the visual back to ClickLock to make it easier and more secure when attaching my camera and when swapping between viewing and imaging. I will be using a Sony Nex 6. I have a camera specific T2 adapter already but I am unsure what other adapters I need to get to the magic number of 133mm. I will not be using the 0.7 reducer. Many thanks!

    Answer rated: 7
    The length of the 2"SC thread is 9,9mm and for that the optical legth of the matching ClickLock gets reduced from 47mm to 37,1mm. From the
    outer end of the ClickLock #2956220 to the focal plane the distance is now 96,25 referring back focus 133,35 minus 37,1

    The camera itself has 18mm backfocus (Sony e=eighteen bayonet) plus11mm for the bajonett/T2 Ring is reducing 96,25mm-(18mm+11mm)
    so we have 67,25mm to brigde with following Items:

    Left is now 2,25mm to take 1mm+1mm+0,3mm from this adjustment rings:
    Please check if your bayonet is 11mm - for example, this ring is only 8,3mm:
    Answer by: Baader Web Team (Admin) on Jul 22, 2019 7:58:00 AM
  119. Rated: 8
    7/15/2020 9:26 PM Baader Wide-T-Ring Nikon Z (for Nikon Z bajonet) with D52i to T-2 and S52
    I don't think I received the right answer to my question on connecting a Nikon Z6 to a Celestron EdgeHD 8.

    According to Celestron, the back focus distance for the EdgeHD 8" is 133.3mm.

    The Nikon Z series has got a flange distance of 16mm, the Wide T-ring is 8.3mm long, so in total its 24.3mm. The Celestron t-adapter is 50mm long for a total of 74.3mm.

    Your answer said I needed 30.7mm of distance, but don't I still need 59mm of distance (133.3 - 16 - 8.3 - 50 = 59)?

    Answer rated: -2
    Maybe the mistake is that there are twi different T-Adapters so please see this two links (sorry only german):

    The EdgeHD T-Adapter #93644 is 78,3mm long and needs an extension of 30,7mm that it fits your camer/bayonet ring.
    The T-Adapter #93633-A (second link) is 50mm long and could be used too. Just keep in mind that you need then of course
    different distance rings/extensions.
    Answer by: Baader Web Team (Admin) on Jul 16, 2020 9:36:00 AM
  120. Rated: 8
    3/7/2019 3:08 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    How long is the nose piece (the part that inserts into the focuser tube) on the 37mm extension (2956237)?
    I have the 47mm extension and the nose piece is 27mm on that it the same?

    Answer rated: -2
    In deed the nose pieces are different. The length of the 37mm version is ca. 24mm.
    Answer by: Baader Web Team (Admin) on Mar 8, 2019 11:56:00 AM
  121. Rated: 8
    12/12/2019 7:41 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    I've very interested in this product but want to make certain I'm clear on what I would need to use it with my old model C9.25, ZWO ASI1600MM Pro (6.5mm back focus distance), ZWO EFW (20mm thick) and ZWO OAG (16.5mm thick).

    In addition to the Alan Gee & the provided 19mm spacer tubes, I would need:
    BTA T-adapter
    Baader Varilock 29 (at 20mm position)
    Baader Centering ring

    Is that correct?
    Thank you.

    Answer rated: 1
    Yes, you need
    - Centering ring for Alan Gee II Telecompressor # 2454410 to use the Alan Gee at the C925
    - Baader T Adapter (BTA) for SC and MAK Telescopes # 2408160
    - Baader VariLock 29, lockable T-2 ExtensionTube 20-29mm with spanner tool # 2956929 at ca. 20mm

    You can play around a liitle bit with the length of the VariLock to vary the magnification factor, if you want to.
    Answer by: Baader Web Team (Admin) on Dec 16, 2019 12:37:00 PM
  122. Rated: 8
    8/25/2019 12:49 PM Baader f/2 Highspeed-Filters (H-alpha, O-III, S-II)

    Answer rated: 2
    While the 2" Filter would technically fit (same housing as our Neutral Density Filters) we have to strongly warn you that this product combination is not approved and does not make sense. The here mentioned H-alpha f/2 Highspeed-Filter is not suitable for Solar Observation in any way, but for the H-alpha lines in Deep Sky Astrophotography. As always with Solar Observation: Only use this product if you feel well informed about its properties and the requirements for safe handling and storage.
    Furthermore the Herschel Wedge also reduces the H-alpha light by design because it blocks all wavelenghts, so H-alpha filter behind it would result in a dark image.
    Answer by: Baader Web Team (Admin) on Aug 26, 2019 8:07:00 AM
  123. Rated: 8
    6/11/2017 3:47 AM Baader Safety CoolCeramic Herschel Prism 2" Photographic Version
    Greetings. I am having focusing issues with this product on a Televue NP 101 (non is) telescope. Are there adapters than can help with this?
    Thank you.

    Answer rated: 0
    If your problem only occurs with a camera, you can replace the 2" Clicklock clamp with the T-2-adapter #1508035 to attach the camera directly to the Herschel wedge.

    If you have problems with eyepieces, you can try to use the adapter #1508035 to attach another eyepiece clamp with T-2-thread - e.g. #2458100 - or an eyepiece, where the field stop is moved into the 2"-barrel, closer to the telescope.

    The Herschel Wedge requires a backfocus of 114mm, of this 47mm are used by the 2" Clicklock clamp. To measure the backfocus of your telescope, point the telescope at the full moon, hold a piece of paper behind it and measure the distance between the drawn-in focuser tube and the sharp image of the moon.
    Answer by: Baader Web Team (Admin) on Jun 12, 2017 10:15:00 AM
  124. Rated: 8
    11/12/2017 12:38 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I intend to place your ClickLock eyepiece holder on my personal construction telescope.
    The M64 (Takahashi) or the M60 (vixen) model could suite . But I do not have their thread pitch.
    What is the thread pitch of the M64 ClickLock (Takahashi ref # 2956264) and the M60 ClickLock (Vixen, ref # 2956260) ?

    Thank you.

    Answer rated: 39
    Both ClickLocks M60 and M64 are made with a 0,75er pitch and fits with Takahashi and Vixen.
    Answer by: Baader Web Team (Admin) on Nov 13, 2017 12:51:00 PM
  125. Rated: 8
    11/21/2018 12:13 PM DADOS Slit – Spectrograph
    I am interested in buying a Dados spectrograph. Which of the CCD/CMOS cameras available today would you recommend to use with it?

    Many thanks

  126. Rated: 8
    1/18/2017 11:53 PM 2" Glasspathcorrector® 1,7x for Newtons
    Is it possible to stack GPC's without losing image quality?

    For example, a 1,25x or 1,70 GPC on top of the 1,7x newtonian GPC with a Mark V binoviewer. That would give a nice flexibility.

    Answer rated: -26
    Sorry, GPCs are not designed to be stacked. Dual stacking will create spherical aberration - unfortunately we cannot recommend it.
    Answer by: Baader Web Team (Admin) on Jan 19, 2017 5:04:00 PM
  127. Rated: 8
    2/25/2021 12:57 PM Baader 2" ClickLock Diagonal Mirror
    Hey! I wonder whether it'll work well with Skywatcher 72ED?

    Answer rated: 1
    It seems that this telescope has a little problem with eye pieces of short focus lenghtes that the focuser cannot travell deep enough (in-focus).
    Obviously SkyWatcher is aware of this problem, the tube of the newer models are 10mm shorter.

    Okay, about our star diagonal you can find here more information according the lengthes:
    Maybe you can turn in the focuser fully and picture the moon on a white sheet of paper (without eye piece/ star diagonal) so you´re able to
    measure the distance with a ruler to find out the back focus length.
    Answer by: Baader Web Team (Admin) on Feb 26, 2021 9:59:00 AM
  128. Rated: 8
    12/29/2018 12:06 AM Mark V Großfeld (Giant)-Binocular
    I like to buy a Mark V Großfeld (Giant)-Binocular. With the Bino I like to buy a Glasspathcorrector.
    I am using a Takahashi 120 refractor (TSA-120) F/7.5. Would Glasspathcorrector Factor 2,6 be a good choice?
    Also, I like to ask you for what Diagonal to chose for this Bino. I have the Baader 2" ClickLock Diagonal Mirror # 2956100, for a year and I am very, very pleased with it!!
    Should I choose this diagonal # 2956100, or should I chose Baader 2" ClickLock Diagonal Mirror M68 thread (Zeiss) # 2956100Z for the Mark V Großfeld (Giant)-Binocular with Glasspathcorrector Factor 2,6 ?

    Answer rated: 9
    For the TSA 120 the glaspath corrector 1,7x would be suitable, but 2,6x works too. Its better to use the T-2 mirrors and not 2" mirrors with the Mark V binocular, the long way that the light travels through a 2" mirror may be too long to reach focus.
    Answer by: Baader Web Team (Admin) on Jan 3, 2019 12:25:00 PM
  129. Rated: 8
    10/15/2019 6:33 PM Baader UFC (Universal Filter Changer)
    Meanwhile the RASA 8 is widely available at a lot of stores. Has there been any further development of the Baader UFC for the RASA 8 ?

    Answer rated: 5
    We are working on a new item that allows to place filters in front of RASA 8 to attach all kind of cameras. Furthermore it will be able to tilt the camera easily, means to collimate the RASA without removing the camera. The item is currently in Betatesting, we hope we can offer it early 2020. Please register for our newsletter be informed in time.
    Answer by: Baader Web Team (Admin) on Oct 16, 2019 8:42:00 AM
  130. Rated: 7
    1/13/2019 12:34 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    If the zoom is modified to fit a Celestron Regal M2 spotting scope, can I then use it with a Celestron Barlow x2?

    Answer rated: 4
    You can use the Hyperion with a Barlow lens, but not on a spotting scope - usually, Barlow lenses do not work with spotting scopes because of missing backfocus; they can't be inserted deep enough. It is no problem on a telescope.

    To achieve higher magnifications, you need another eyepiece. Unfortunately, there is no Zoom available. You can find an overview about the Celestron eyepieces at
    Also, our Classic Orthos and Morpheus eyepieces work.
    Answer by: Baader Web Team (Admin) on Jan 14, 2019 8:38:00 AM
  131. Rated: 7
    1/31/2018 10:21 PM 2" BDS-NT Baader Diamond Steeltrack® Focuser
    Is there a unit suitable for a Celestron CPC 9.25"? the one in description says newtonian. Thanks

    Answer rated: -7
    The CPC 9.25" is a Schmidt-Cassegrain telescope. So you will need the BDS-SC Steeltrack:
    Answer by: Tobias Baader (Admin) on Feb 1, 2018 8:39:00 AM
  132. Rated: 7
    1/21/2019 3:28 PM Baader L-RGB CCD-Filterset
    I have a Celestron 11" RASA. I am using Baader high speed F/2 H-alpha / S-II / O-III filters.
    1. Are these LRGB filters suitable, do the LRGB filters need to be matched to the F/2 as well similar to the H-alpha etc.?
    2. If they are suitable are they parafocal with the high speed F2 filters? So I can focus using the L filter and swap to the H-alpha ?
    Thank you.

    Answer rated: 6
    1. Since the LRGB have a wide bandpass, the focal ratio of the telescope is not relevant. You can use them with your instrument.

    2. This depends on the thickness of the filters. If you are using LRGB and narrow band filters of the same size,
    they have the same thickness, therefore they are parafocal.

    Answer by: Baader Web Team (Admin) on Jan 30, 2019 5:04:00 PM
  133. Rated: 7
    9/26/2020 1:17 PM Baader SC / HD Ultra Short T-Adaptor, 7mm optical length
    The optical length is listed as 7mm here. Many resellers are listing it as 10mm. My own measurements with calipers say 9mm. Are there multiple versions of this adapter? What is the correct expected optical length?

    Answer rated: 5
    Correct is actually ~7,5mm with the T-2 Finetuning-Ring from the top thread removed. When you leave the finetuning ring on, it is about ~8.3mm.
    Answer by: Baader Web Team (Admin) on Sep 28, 2020 10:11:00 AM
  134. Rated: 7
    6/28/2019 12:02 PM 2" BDS-RT Baader Diamond Steeltrack Focuser
    I have a 2 inch Baader Diamond Steeltrack RT. Can you please confirm the function of the tension brake screw? When this screw is loosened, both the coarse and fine focus knobs can be turned. However when I tighten this screw, the coarse focus knob locks, but the fine focus knob can still be turned and the drawtube and the fine focus knob move as normal. Also when I tighten this screw, focus shifts. Is this correct behaviour, or should tightening this screw lock both knobs and the drawtube. This is not clear in the manual. Thanks.

    Answer rated: 5
    What you are experiencing is normal. The tension brake screw, as the name suggests, is used to inrease or decrease the tension on the focuser, changing like this the force required to move the focuser. Eventually when the screw is tightened, it functions as a brake and the focuser doesn't move anymore. In this case, the coarse focus knobs cannot be turned, but the fine coarse yes. However this movement isn't translated into focus change due to a gearbox built in the mechanics of the focuser. As for the focus shift, it is a mechanical play created from the needed tolerances. When you tighten the screw, it causes the whole focusing mechanism to be pulled toward you, until it is totally play free.
    Answer by: Baader Web Team (Admin) on Jul 3, 2019 2:59:00 PM
  135. Rated: 7
    2/19/2020 3:12 PM 2" BDS-RT Baader Diamond Steeltrack Focuser
    I have a Scopos TL 805 and I would like to change my eyepiece because I have tilt.
    I would like to have a clarification concerning the fixing of the BDS-RT (# 2957210).
    Indeed, I have contradictory information. In the specifications, I see that the fixing is possible in 88mm dovetail but on this site:
    72mm dovetail receiver permits 360-degree rotation of focuser with single-screw locking.
    He's talking about a 72mm dovetail.
    Can you clarify this point or offer me a fixing solution?

    Answer rated: 5
    The Steeltrack RT has got an 88mm dovetail (S88), on which the telescope adapter is attached to (an S88 to M68 adapter is included). Any adapter which is connected to this dovetail is locked by 6 screws (five headless screws to adkust the tension plus one large locking screw which can be operated manually without tools). If you open the large screw, you can totate the Steeltrack around every adapter which uses the S88 dovetail.

    The Steeltrack doesn't come with a 77mm-dovetail, so I suppose that's just a typo on the website of Agena.
    Answer by: Baader Web Team (Admin) on Feb 20, 2020 8:40:00 AM
  136. Rated: 7
    3/6/2018 11:05 PM Baader DSLR-2" Filter Holder M48/SP54
    Hi, could you please tell me what products I would need to fit a 2" filter to a lens of 40.5 mm diameter?

    Answer rated: 6
    Unfortunately, we do not have a stepper ring for M40.5. You need either a stepper ring from M40.5 to SP54, or to one of our stepper rings.
    We do have:
    M46: DT-ring SP54 / M46 #2958046
    M49: DT-ring SP54 / M49 #2958049
    M52: DT-ring SP54 / M52 #2958052
    M55: DT-ring SP54 / M55 #2958055

    So, you need:
    - Baader DSLR-2" Filter Holder M48/SP54 #2408166
    - One of the stepper rings above. They all have a female (inner) SP54 thread and a male (outer) thread
    - A stepper ring from M46, M49, M52 or M55 to your M40.5-thread. One of these stepper rings should be easily available at your preferred photo-dealer
    Answer by: Baader Web Team (Admin) on Mar 7, 2018 12:06:00 PM
  137. Rated: 7
    1/8/2021 11:10 PM Glasspathcorrector 1:1,70 for Baader-Binoviewer with T-2 thread (MaxBright II® and MaxBright®)
    I am using the original Maxbright with a pair of 17.5 Morpheus and a 2" Everbrite Dielectric diagonal on a Celestron 8SE.
    Can you please tell me what is the exact magnification I will get when using the 1.7 GPC. Thank you

    Answer rated: -2

    Focal length of your telescope is 2000mm x 1,7 (Glaspath corrector) : 17,5mm (Focal length of your eyepiece) = roughly 194 x magnification

    Answer by: Baader Web Team (Admin) on Jan 9, 2021 5:18:00 PM
  138. Rated: 7
    10/4/2020 11:34 AM Glasspathcorrector 1:2,60 for Baader-Binoviewer with Zeiss ring dovetail (MaxBright® II and Mark V)
    Does this corrector affect the eye relief of my eyepieces?
    I use your Zeiss 1.25 dagonal and Maxbright II binoviewer.
    Thank you!

    Answer rated: 0
    It does not influence Eye relief in a negative way (inward). What might happen is that - like with a barlow-lens - the eye distance does increase slightly.
    Answer by: Baader Web Team (Admin) on Oct 5, 2020 11:07:00 AM
  139. Rated: 7
    4/13/2018 1:11 PM Steeldrive motor drive for classic Steeltrack focusers
    I have a Steeldrive focuser motor which works fine except that the temperature never has been detected by the handcontrol or SteelGo/ASCOM. The manual suggests to fasten some screws, which has been tried without success. Do you have a solution to this problem?

    Answer rated: 5
    Please try first to check the temperatur sensore by using a voltmeter. The sensore should give back different resistance value in ohm so
    you can see if the sensore is defect or may be something else.
    Answer by: Baader Web Team (Admin) on Apr 17, 2018 4:48:00 PM
  140. Rated: 7
    8/14/2019 6:17 AM Baader 2" Nosepiece with 2" filter thread
    I can not connect it with ClickLock clamp for 2" SC thread #2956220. The thread pitch is thin a bit. Is this in the spec?
    I would like to know which product is suitable as same as a nosepiece of 2" Herschel prism #2956500?

    Answer rated: -4
    The Baader 2" Nosepiece with 2" filter thread (T-2 Part #: 19) # 2408155 is the one which is also used in the Herschel wedge and should fit to the Clicklock #2956220.

    It may be that there is a little bit of the anodized coating too thick inside of one of the threads - please take a look at the thread; if it is blocked somewhere, just take a knife and go along the thread once to clean it.
    Answer by: Baader Web Team (Admin) on Aug 14, 2019 4:37:00 PM
  141. Rated: 7
    12/19/2016 5:34 PM VIP 2x modular barlow lens, visual and photographic
    I understand that the optically active element of the VIP-Barlow is the 2.6x glass-path-corrector lens referenced "4C" in the T2 system. Is that correct ? If not, Is the active element for sale alone ?

    Answer rated: -22
    Thanks for this question, to make it short: it is not correct. We did repeat it many times but somehow it is not getting noticed - the 2.6x glasspath-corrector (# 2456317) is NOT a barlow lens.

    The 2.6x glasspath-corrector is solely designed to provide the necessary backfocus for using binoviewers in conjunction with newtonian telescopes and refractor telescopes. For correcting for the huge amount of glass in our Mark V giant binoviewer (# 2456410) - and likewise in the newly designed Maxbright Mark II binoviewer that is still under preparation at this time.

    Both lens elements of the Baader 2x VIP-Barlow (# 2406101) and the 2.6x glasspath-corrector (# 2456317) do look quite similar when inspecting them by eye only (they use the same housing) - and we are very sorry that through the years this is always again creating confusion in the forums. However - we always again reiterate that the two products are not the same lenses and cannot be used for serving a dual purpose.

    In case you were ordering the 2.6x glasspath-corrector and would use this product as a 2x barlow lens, you would find out that it creates severe chromatic errors if used in this (wrong) mode. The same accounts if trying to use the 2x VIP-barlow-lens as glasspath-corrector in conjunction with a binoviewer - you would see color error and conclude that the lens were faulty.

    We never said that these two products may be used for the other purpose, but always again people look at them and conclude they were the same - which definitely is not the case. Both products work excellent if used for their specific purpose. But since they repeatedly are being (ab)used in either/or configuration, some people concluded both designs were flawed. Again - this definitely is not the case.

    Thanks for purchasing the VIP-Barlow if you want a barlow lens. We are sorry but the barlow-element alone is not available. If you intend to use a barlow element only that readily threads into regular 1 1/4" filter threads, we do recommend our Q-Barlow 2.25x Link (# 2956185).
    Answer by: Baader Web Team (Admin) on Dec 20, 2016 11:36:00 AM
  142. Rated: 7
    11/8/2018 7:25 PM Baader Hyperion 68° Eyepiece Set (Starter)
    Do I need to remove the 1 1/4" barrel when fitting these lenses to a telescope with a 2" focuser?

    Answer rated: 2
    No. There are lenses in the 1,25" barrel, if you remove it, you will have a wide angle eypiece with long focal lenght and poor correction. More useful tips can be found in the manual: in the download section of the product page
    Answer by: Baader Web Team (Admin) on Nov 9, 2018 9:40:00 AM
  143. Rated: 7
    3/31/2019 7:14 PM Baader UHC-S / L-Booster-Filter
    Does this filter work as Luminance?

    Answer rated: 2
    You can use this filter as Luminance filter when you fight with light pollution. In other cases, when the sky is very dark and clear, our clear filters are the perfect solution.
    Answer by: Baader Web Team (Admin) on Apr 1, 2019 8:57:00 AM
  144. Rated: 7
    11/10/2017 8:34 PM
    Dear Baader, I have a s\c Meade 10' LX200, can I use this bar for my OTA?

    Answer rated: 5
    The thread holes of the Meade OTAs are different to those from Celestron. I´m sorry but unfortunately this bar will not fit onto your telescope.
    Answer by: Baader Web Team (Admin) on Nov 13, 2017 9:07:00 AM
  145. Rated: 7
    6/6/2018 1:53 PM Glasspathcorrector 1:1,70 for Baader-Binoviewer with T-2 thread (MaxBright II® and MaxBright®)
    Hi, what is the difference (technical and in pratical use) between this correctors, #2456316 1.7x and #2456305 1.8x? Thank you.

    Answer rated: 5
    The 1.8x for refractors and SCTs must be inserted rather deep into the focuser, so it doesn't work with all SC-telescopes (because of the inner diameter) and refractors (if they have internal field flatteners, Petzval-elements or similar). It also requires the use of the T-2-mirror #2456100 with an optical length of 43mm to keep the correct distances.

    The 1.7x is more flexible: It can be used with other star diagonals, too, as well as behind e.g. a Herschel Wedge for solar observation. It is also mounted the same way as the 1.2x, which may be more comfortable if you work with different glass path correctors to achieve several magnifications. That's why we usually recommend the 1.7x
    Answer by: Baader Web Team (Admin) on Jun 6, 2018 3:45:00 PM
  146. Rated: 7
    9/16/2019 5:10 PM Baader f/2 Highspeed-Filterset H-alpha / OIII / SII
    Hi, his this set suitable for a f/d more than 6.7 and an ASI1600 ?

    Answer rated: 10
    As written in the product description, these filters are only suitable between f/1,8 and f/3,5. They work with ASI 1600 but many customers claim that due to back reflections of the camera window there are Halos possible with this camera and very narrow filters, especially OIII
    Answer by: Baader Web Team (Admin) on Sep 17, 2019 9:30:00 AM
  147. Rated: 7
    6/30/2017 3:53 PM Baader Multi-Purpose Vario Finder 10x60 (single or with MQR-IV finder holder)
    I want to use this finderscope as a 61mm achromatic refractor piggybacked on my 8" SCT, when not "finding". Am I giving too much confidence to this little scope?

    Answer rated: 1
    We think you planned use can very well be supported by this scope.
    You will have to get used to the sliding focuser but it can be managed well with a little goodwill.
    Answer by: Baader Web Team (Admin) on Jun 30, 2017 4:17:00 PM
  148. Rated: 7
    7/4/2018 8:37 AM 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons)
    Hi, i purchased your mpcc mkiii, and i would like to know which ring i need to use with a nikon d800?

    Answer rated: 17
    You can use any standard T-ring like the Baader T-Ring Nikon to T-2 #2408300

    All regular T-rings (but not the low profile adapters) provide the necessary distance of 55mm, which is an industrial standard.
    Answer by: Baader Web Team (Admin) on Jul 4, 2018 11:41:00 AM
    Answer rated: 10
    Thanks for the update!
    I have a m48 t-ring on my d800, do i need to use the badeer m48 extender to compensate the small ring i removed from the coma corrector?
    Answer by: Ludovic Duvert-gauge on Jul 4, 2018 12:37:58 PM
  149. Rated: 7
    7/5/2018 3:19 AM Baader Hyperion Zoom M43 / SP54 Adapter
    Hi do i need this adapter to connect the hyperion mark IV zoom to my canon dslr or do I need adapter #2958080? Thanks!

    Answer rated: 2
    You´ll need the 2958080 ring to connect a Canon DSLR onto the eye piece:

    This document will give you a lot of information on how to connect the camera:
    Answer by: Baader Web Team (Admin) on Jul 5, 2018 9:02:00 AM
  150. Rated: 7
    7/5/2018 10:39 PM Baader Standard Base - for MQR III&IV, for Witty One & for V-Bracket
    What are the maximum dimensions of dovetail that this base will hold?
    I picked up a used 60mm guide-scope that came with a standard (43mm) v-style dovetail base and I am having trouble finding a finder base that will support a dovetail that big.

    thank you

    Answer rated: -4
    The widest point of this base is approx. 34mm and therefore too small for Vixen dovetail. I´m sorry but so far we don´t have a solution for this case.
    Answer by: Baader Web Team (Admin) on Jul 6, 2018 10:21:00 AM
  151. Rated: 7
    7/12/2017 4:56 PM Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
    Is the prism in this diagonal (#2456117) a Carl Zeiss spec prism?

    Answer rated: 13
    Yes, this prism is produced according to the Carl Zeiss specifications
    Answer by: Baader Web Team (Admin) on Jul 13, 2017 1:58:00 PM
  152. Rated: 7
    2/2/2017 9:35 AM Canon Camera Astro Upgrade
    Does Baader offer modification service to convert the Canon DSLRs to a "full-spectrum" DSLR, i.e. providing a camera without any filters to restrict the pass-band of radiation to the camera sensor?

    Answer rated: 11
    No, unfortunately we do not offer such a service.
    Answer by: Baader Web Team (Admin) on Feb 2, 2017 10:08:00 AM
  153. Rated: 7
    1/3/2018 12:57 PM Baader Tripod Adapter Flange for NexStar SE / EVO
    Will this adapter also work with Celestron CPC mount for Baader T-pod? I believe drilling is same as evo/se. Which version T-pod would work best?

    Thanks to you

    Answer rated: -2
    Yes, this flange filts on T-Pod and works with CPC mount.
    We recommend the Baader T-Pod 130
    Answer by: Baader Web Team (Admin) on Jan 4, 2018 10:46:00 AM
  154. Rated: 6
    1/15/2019 7:52 AM Reducing piece S52 / M48
    Does this part have the s52 dovetail on both sides?

    Answer rated: 5
    The S52 Dovetail is only at the outer side in a way that the inner M48 thread points to the telescope/lense. Please refer the application Images
    according this item.
    Answer by: Baader Web Team (Admin) on Jan 15, 2019 9:43:00 AM
  155. Rated: 6
    1/15/2019 11:49 PM 2" BDS-NT Baader Diamond Steeltrack® Focuser
    Would it be possible to fit this to a Skywatcher 130 PDS?

    Answer rated: -7
    We do not know the positions of the bore holes of all Newtonians, but please take a look at the technical drawing of the Versa Base which you can find in the Download-section of the product page of the Steeltrack, or directly at

    If the holes fit, you can simply replace your focuser with the SteelTrack for Newtonians. Please note that the Steeltrack is designed for tubes with 20cm diameter or larger; for smaller tubes, you need additional spacers (#2957235).
    Answer by: Baader Web Team (Admin) on Jan 16, 2019 9:53:00 AM
  156. Rated: 6
    8/17/2017 2:43 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I'm looking for a 2" clicklock solution to my Explore Scientific 80 mm ED APO. Unfortunately I cant find the appropriate dimension in your selection. The scope side connection has an external M54 threading (0,75). Can you suggest a solution for me, if necessary in combination with an adapter? I earlier purchased a clicklock for my C14 and I am very happy with the quality of this product.

    Answer rated: -7
    We do have an M54 ClickLock but this has also an M54 external thread (fitting for Skywatcher/Orion). So you would need an inverter ring from M54 external to M54 internal thread. Unfortunately we don't have such an adapter or another solution. The only adapter we have that would fit is our DT-Adapter II (#2458040) - but this would reduce the inner diameter to T-2 and you would have to get a T-2 inverter ring and then use our 2" T-2 Clicklock. Not the best solution...
    We would suggest to get an M54 inverter ring custom made at a milling company. There is a company in Germany who does such things, but we don't know if they ship international:
    Answer by: Baader Web Team (Admin) on Aug 17, 2017 3:38:00 PM
  157. Rated: 6
    1/29/2020 6:34 PM Baader Tripod Adapter Flange for NexStar SE / EVO
    Will this adapter work with the AVX tripod?

    Answer rated: -3
    No, unfortunately the AVX uses a new design for its base, and the flange does not fit.
    Answer by: Baader Web Team (Admin) on Jan 30, 2020 8:48:00 AM
  158. Rated: 6
    2/14/2018 3:17 PM Baader DSLR-2" Filter Holder M48/SP54
    I want to get your 2" filter and place it in my imaging chain with standard 48mm 0.75mm threads on both sides (one male one female). It looks like your 2" filter uses 48mm threads with nonstandard pitches, so I need to buy adapters but I cannot figure out which adapters to get. Thanks!

    Answer rated: -13
    As previously answered on another question, our so-called "nonstandard pitch" differs only very slightly to allow adaptation of Baader filters to the many different pitch variations. So we are very confident that our filters will fit into your image chain.
    Answer by: Baader Web Team (Admin) on Feb 14, 2018 3:23:00 PM
  159. Rated: 6
    9/23/2020 9:32 AM Baader MaxBright® II Binoviewer with case
    I am considering a purchase of binoviewer to use with my 305/1500 collapsible SkyWatcher dob. I would like to use ADC for planetary viewing, hence I need at minimum a 2x barlow/f.extender. my question is: could the 2.6 GPC be placed before ADC, i.e. can additional 55mm of lightpath be introduced between the GPC and binoviewer (OTA -> 2.6 GPC -> ADC -> bino)? Focusing distance is not much of an issue, since mirror can easily be moved. I am more interested in understanding how GPC will behave - is it sort of telecentric or 2.6x effect with distance becomes 3x or more.

    Answer rated: -1
    The glasspath corrector behaves more like a barlow lens than like a telecentric - it's best if you think of it as a barlow lens which also corrects the colour aberations of the prisms.
    Answer by: Baader Web Team (Admin) on Sep 23, 2020 12:15:00 PM
  160. Rated: 6
    10/28/2019 2:59 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Do u know which baader adapter fits my Meade 6000 115mm APO triplet refractor?

    Answer rated: 3
    We do not have the specifications for all telescopes available on the market. If there is enough back focus, you can always insert one of the 2"-extensions #2956237 37mm ClickLock extension or #2956247 47mm ClickLock extension into your existing eyepiece clamp.

    Otherwise, we need the specifications of your telescope - does it provide a thread or a dovetail, and can you unscrew your existing clamp? Then you can measure the thread as described here: Chances are good that we already have a ClickLock with the matching thread.
    Answer by: Baader Web Team (Admin) on Oct 28, 2019 9:31:00 AM
  161. Rated: 6
    10/13/2016 5:19 PM Baader H-alpha 35nm CCD Filter
    I have bougth an used filter #2458380, but on the body filter, in the original Baader label, is written "H-Alpha 45nm Passfilter 2" wIR-cut.
    Since in your catalog the #2458380 is 35nm filter, my question is: there where an old version with same P/N but different band?
    Thanks a lot in advance for your help.
    best regards

    Answer rated: -15
    Yes it is true - the older filters had 45 nm bandpass.
    Answer by: Baader Web Team (Admin) on Oct 14, 2016 8:32:00 AM
  162. Rated: 6
    9/30/2020 1:57 PM Baader Double Polarizing Filter
    My Baader Hyperion 5mm Eyepiece without his ruber ring offers two thread : M43 and SP54 (male) What ring adapter model is necessary for use a 2" filter like this one : Baader Double Polarizing Filter 2" ( #2408344) ? It seems I need a "female 48 / female SP54" ? Thank you

    Answer rated: -1
    Placing a 2" filter behind the eyepiece will cost you a lot of eye relief - the 2" double polarizing filter will cost you 15mm, so that you will have only 5mm of eye relief remaining.

    It might be possible with Baader DSLR-2" Filter Holder M48/SP54, # 2408166, but I didn't try it out - it has got a length of 5mm, then you'd have no more eye relief and wouldn't be able to look through the eyepiece...

    You can insert 2"-filters between the 1.25" nosepiece and the 2" body of the eyepiece, but this will change the focal length of your eyepiece to ca. 4-4.5mm as described in this PDF:

    The recommended solution would be a 2"/1.25"-reducer with 2" filter thread, if your telescope has got a 2"-focuser:
    Answer by: Baader Web Team (Admin) on Oct 1, 2020 10:19:00 AM
  163. Rated: 6
    7/9/2020 4:01 AM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    I want to do projection photography with the Zoom Mark IV using a Canon EOS R with and without the Hyperion-Barlow 2.25x using the 2" barrel with my telescope.

    I believe I can do this by using a Wide-T-Ring Canon R (2408336), a UFC S52 Camera-Adapter (2459119), a UFC Base (2459110), a UFC S70 / T-2 Adapter (2459130), a Baader TQC/TCR Heavy duty T-2 Quick Changing System (2459130) and a M43 / T-2 Adapter (2958080).

    What I am not sure of is exactly what UFC S70 and/or T-2 extensions I would need to get the recommended back focus for use with the full frame EOS R camera. I am also not sure if I could fit the #2459130 in the setup, it would be convenient but by no means necessary. I am also not sure if I would require different extensions when using the Barlow.

    Can you please confirm if these parts will work as I intend (with or without the #2459130), what extensions I should use to get the recommended back focus with the EOS R camera and if I need different extensions when using the Barlow?

    Answer rated: 4
    Under the link Downloads you can find our PDF according digiscopie:
    I´d prefer to adapt the camera this way: 2 pieces

    And as a separate combination:

    Then you´re able to fast change filters and eye pieces. Just take care that it needs about 60mm back focus and it doesn´t
    allow using the zoom with barlow. On the other hand, please refer the first digiscopie PDF last page that you can reach an
    enormous focal length anyway. It should´nt be neccessary using the barlow.
    Answer by: Baader Web Team (Admin) on Jul 10, 2020 2:22:00 PM
  164. Rated: 6
    2/26/2019 8:50 AM Baader UBVRI Photometric Filterset (4mm Glass)
    Are these filters parfocal with other filter, such as a clear filter or narrow band imaging filters?

    Answer rated: 4
    Because the glass thickness is 4mm these are not parfocal with other filters of different thickness
    Answer by: Baader Web Team (Admin) on Feb 26, 2019 9:20:00 AM
  165. Rated: 6
    3/20/2020 9:33 AM Baader FlipMirror II Star Diagonal
    In order to use the OAG port at the base of the flip mirror, the prism can only go so high before it will hit the mirror when ‘down’. If your connection to the telescope relied on a 1.25” nosepiece rather than a 2” / T2 /M48 connection, would the light ever reach the prism as it would be too low to pick up any light?

    Answer rated: 5
    In its downward position, the mirror has got a length of ca. 2,5cm, so there are only 2-3mm for an autoguider prism. This might just work, but we wouldn't recommend (and be at peace with ourselfes).
    To be honest, autoguiding is usually used for larger sensors which would be obstructed by a 1,25"-focuser anyway, and most focusers which are strong enough for a flip mirror, a camera, a guiding camera and maybe even an eyepiece are 2"-focusers, so we preferred a larger mirror.
    Answer by: Baader Web Team (Admin) on Mar 20, 2020 2:48:00 PM
  166. Rated: 6
    5/14/2017 11:06 AM SolarSpectrum 0.7x Telecompressor 2"
    Which way round should the 0.7x telecompressor go in the optical chain? i.e. which is the front and back of this optically and how would I know how to orientate it?

    Answer rated: 1
    The longer 2" thread points towards the camera.
    Answer by: Baader Web Team (Admin) on May 15, 2017 9:39:00 AM
  167. Rated: 6
    10/15/2018 7:42 PM Baader 2" ClickLock Diagonal Mirror
    What is the right type of screw driver to loosen the 6 M2.5 screws so the Click lock can be removed?

    Answer rated: -7
    You need an 1.3mm Allen key/hexagon socket wrench.
    Answer by: Baader Web Team (Admin) on Oct 17, 2018 8:54:00 AM
  168. Rated: 6
    8/16/2019 2:55 PM Baader DSLR-2" Filter Holder M48/SP54
    I would like to use a 2" UV Filter on a lens with 46 mm thread. Could you please tell me which additional rings I need for this.

    Answer rated: -2
    In addition to the 2"-filter and your camera, you need:
    Baader Hyperion DT-Ring SP54/M46 for DTAdapter II&III and Hyperion Eyepieces # 2958046
    Baader DSLR-2" Filter Holder M48/SP54 # 2408166
    Answer by: Baader Web Team (Admin) on Aug 19, 2019 10:48:00 AM
  169. Rated: 6
    12/12/2016 11:28 AM Telecentric System TZ-2 (2x focal length)
    I would like to know when the TZ3 will be available.

    Answer rated: 1
    The TZ-3 is now available. Please check out here:
    Answer by: Baader Web Team (Admin) on Feb 2, 2017 9:26:00 AM
    Answer rated: -21
    The TZ-3 Telecentric System will become available in February 2017
    Answer by: Baader Web Team (Admin) on Dec 12, 2016 11:56:00 AM
  170. Rated: 6
    6/6/2017 9:45 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have an 8 Edge HD with the Celestron HD Focal reducer and would like to use the combination of Baader ClickLock and a diagonal WITH the Celestron Edge HD focal reducer. What would be your suggestions if I would like to use the Baader ClickLock system for visual and/or AP, keeping in mind the required 105 mm from Reducer to camera sensor by Celestron, and do I need the Celestron T-adapter also?

    Answer rated: 44
    The SC-Clicklock has got a length of 47 mm, the distance from a T-2-adapter to the sensor of a DSLR is 55mm. Our T-2/2"-adapter #2408150 adds another 2.5mm, so you are at 104.5 mm which meets the tolerances pretty good - Celestron gives a tolerance of +/- 0.5mm for the EdgeHD. You may use the Baader T-2 adjustment/spacer-rings #2458102 for the perfect distance. The Celestron T-adapter is not required then.

    Visual use is a bit complicated, because a star diagonal like #2956100 already has got an optical length of 112mm incl. Clicklock clamp. You can remove the nosepiece, then you'll have a 2"-thread with which you can attach it directly to the reducer - but you'll need the NexStar Locking Ring #2458270 to rotate it into a convenient position. It is 5mm thick - please check if the thread at the Celestron reducer is long enough.

    But for visual observation, it is not as critical as for photography - we even have customers who have adapted a focuser to an EdgeHD and are happy with the results.
    Answer by: Baader Web Team (Admin) on Jun 12, 2017 12:25:00 PM
  171. Rated: 6
    11/9/2017 2:22 PM Baader H-alpha 35nm CCD Filter
    Does the filter block IR radiation right down to 2400nm. Solar radiation extends that far. KG3 heat absorbing glasses protect down to 2400nm. On your UV IR blocking filter you say it is better than KG3 so that implies that goes down to 2400nm.

    Answer rated: 10
    Our H-alpha filters are developed with the usage of CCD imaging in mind. The most used camera chips are sensitive to light with a wavelength up to 1150 nm. Therefore blocking the light on such stretched region, would have resulted in an unnecessary cost increase.
    We do not use KG- glass because it does not allow 100% transmitance on the visible spectrum. In this respect, our filters acheive a better result than KG glass.
    Answer by: Baader Web Team (Admin) on Nov 10, 2017 8:32:00 AM
  172. Rated: 6
    4/20/2020 9:59 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    #2956254 M54a x 1-ClickLock (Skywatcher / Orion)
    I have a Quattro and the manual says this is a 54.5mm x 1 thread. I have verified this by threading a 54mm x 1 accessory on to the scope and it was very loose. What exactly is the threading on your ClickLock?

    Answer rated: 5
    It is known that this thread is made with a big tolerance so we decided to do our adapter with a diameter of 54,2mm. It is always a kind of
    gambling producing accessories for other brands. Hopefully Sky-Watcher won´t change it. Lastly our ClickLock will fit fine.
    Answer by: Baader Web Team (Admin) on Apr 21, 2020 10:19:00 AM
  173. Rated: 6
    9/11/2019 4:45 AM Baader 10mm Hyperion 68° Modular Eyepiece
    I have a ZWO ASI290MC planetary camera that I would like to attach to my Baader Hyperion 1.25"-2" on a Celestron Nexstar 6SE. What spacing adapter (M43) would I need to attach the ASI290 to the Hyperion 10 mm in order to achieve focus? Would I achieve greater magnification for planetary imaging if I were to attach the ASI290 camera to the Hyperion 10 mm eyepiece instead of using a 2X Barlow?

    Answer rated: 0
    Please take a look at our Digiscoping-PDF at where we describe several options to attach a camera or video module.

    You need some distance between camera and eyepiece to avoid distortions at the edges; but with a smaller sensor, you can get closer. You'll usually achieve higher magnifications than with a Barlow lens; the formulas for calculating the effective focal lengths are inside of the PDF.

    For large sensor and really high magnifications, we recommend the FFC # 2458200
    Answer by: Baader Web Team (Admin) on Sep 11, 2019 8:48:00 AM
  174. Rated: 6
    4/10/2019 4:05 AM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Which Baader Clicklocks, adapters/diagonals are usable and or recommended for Takahashi Mewlon 210?

    Answer rated: 5
    First you need this adapters that you have access to a wide range of further accessories by the common M68 Zeiss thread:

    Then, for example, you can screw on this Items: Item No. #2956268

    An alternate if its back focus critical:

    To be more flexible with this Items you´re able fast from visual to photographical or any other application:

    But you can change any of our 2" diagonals by unscrew the 2" nose piece and 2"/M55 adapter to put on a M55/M68 adapter:
    If you want to use a BBHS Mirror instead etc.
    Answer by: Baader Web Team (Admin) on Apr 10, 2019 8:24:00 AM
  175. Rated: 6
    11/19/2020 2:01 PM Baader 2" ClickLock Diagonal Mirror
    I have a 2” clicklock star diagonal which has had the 2” telescope side nosepiece damaged. Is it possible to purchase a new 2” nosepiece separately?


    Answer rated: -1
    Yes, of course. They are available individually with safety kerfs (included with all Baader 2" prisms/mirrors as standard since about one year):
    or also as traditional nosepiece with undercut (included with previous versions):
    Answer by: Baader Web Team (Admin) on Nov 20, 2020 11:17:00 AM
  176. Rated: 6
    2/8/2017 4:32 AM Baader SC / HD Ultra Short T-Adaptor, 7mm optical length
    I have recently bought this product to help me get a very short connection for my T2 Zeiss prism to my C9.25 SCT rear port. I find that the two "rings" rotate freely with each other - is it normal? Or is this adapter supposed to be a fixed single piece with no rotating components? I am trying to figure out the best way to tighten this to the rest of my system, so that heavy accessories espcially like binoviewers won't rotate freely by accident!

    Answer rated: -19
    This is indeed normal and intended behaviour. The two rings rotate freely exactly for the purpose of being able to align your accessories as preferred. However: when you completely tighten it onto your C9.25 SCT rear port, it will be pressure-locked and wont rotate anymore.
    Answer by: Baader Web Team (Admin) on Feb 8, 2017 3:42:00 PM
  177. Rated: 6
    2/18/2017 6:53 AM
    What is the spacing of the mounting holes? (Astrophysics rings, which i am trying to find a bar for, require 60mm or 3.2 inch spacing)

    Answer rated: 3
    The spacings are 60mm and 88,9mm - thus perfectly suitable for Astro Physics rings.
    Answer by: Baader Web Team (Admin) on Feb 20, 2017 1:53:00 PM
  178. Rated: 5
    9/3/2020 5:29 PM Baader 2" Nosepiece with 2" filter thread
    I have bought the Steeltrack for SC (Celestron Edge HD). Can I screw this nosepiece to the telescope side of the Steeltrack and by doing so use the Steeltrack on a scope with a 2" connection??? I am aware that there could be an issue with back-focus distance.

    Answer rated: 0
    A little unusual but of course you can use the diamond steeltrack with this nose piece. Only thing is that I´d prefer this nose piece instead:
    The savety groove can cause a tilt - depends on the clamp. The nose piece with kerfs is without this trouble.
    Answer by: Baader Web Team (Admin) on Sep 4, 2020 10:43:00 AM
  179. Rated: 5
    10/24/2019 8:02 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    It is usefull on a Meade LX200 classic 10" f/10? Does it works also as field flattener?

    Answer rated: 4
    You cannot insert the Alan Gee in the baffle tube of the Meade telescope like its possible with a C8. But you can install it with other methods (mounting in front of an mirror or prism or camera) that you find described in the manual in the download section of the product page. Unfortunately the corrected image circle is not big enough for full format
    Answer by: Baader Web Team (Admin) on Oct 25, 2019 3:06:00 PM
  180. Rated: 5
    1/30/2020 12:59 AM Baader 36mm Hyperion Aspheric 2" Eyepiece
    Is there a small “mistake" with the drawing of the 31mm and 36mm Aspheric Hyperion EPs? Doc: G\Prosp\Baa\Zub\Okulare\Tabelle_Aspheric-Okulare

    They show the reference surface (plane) or focal plane of the EP as being at different points within the same 31mm or 36mm Hypeion Aspheric EP, when it has the 2” adapter exchanged for a 1 1/4” adapter?

    Since I have the lens and know that the 1 1/4” adapter contains no additional optics, I think it’s unlikely that this can vary with the same EP (with the same P/N) in the box zB both focal points (focal references) cannot be for the same EP.

    I have seven Hyperion EPs and have just added another one - the 36mm Aspheric EP. I suspect I will eventually "succumb" and buy the 31mm as well! One thing about all Baader-Planetarium products is the very detailed descriptions and especially the Q&A provided which greatly helps with pre-sales inquiries.


    Answer rated: -1
    The drawing can be a little confusing, but it is correct: The reference plane is the part of the eyepiece which sits on top of the eyepiece holder of your telescope (the mechanical stopper), but it is not the position of the focal plane - that is inside of the 2"-barrel. Because the 1.25" barrel is longer, the focal plane is in different distances from the reference plane (the end of the telescope).

    For the 2"-configuration, the distance is the value "E", and for the 1.25"-configuration, it is "F".
    Answer by: Baader Web Team (Admin) on Jan 30, 2020 8:12:00 AM
  181. Rated: 5
    1/25/2019 12:04 PM Steeldrive II motor focuser with Controller
    Can the Steeldrive II be mounted to a 2 inch monorail focuser as fitted to a TS Optics Ritchey-Chretien.

    Answer rated: -3
    Unfortunately this will not work, you would have to replace the TS focuser with a Diamond Steeltrack Focusser
    Answer by: Baader Web Team (Admin) on Jan 25, 2019 12:37:00 PM
  182. Rated: 5
    8/28/2018 7:53 PM Eudiascopic ED eyepiece 35 mm - 1¼"
    Hi Do you still have these eyepieces ?
    Eudiascopic ED 35mm?
    I would like to buy a pair.

    Thank you

    Answer rated: 0
    Yes, these article is available. If you cannot complete the purchase over our website, it means that we do not deliver to your country. Please refer to our Dealer Locator section to find the closest dealer near you.
    Answer by: Baader Web Team (Admin) on Aug 29, 2018 10:52:00 AM
  183. Rated: 5
    3/31/2017 6:16 PM RCC I, Rowe Coma Corrector
    Where can I find the documentation for the RCC-I?
    At least a drawings showing where to measure the 91.5 mm back focus would be helpful.

    Answer rated: 7
    Our translator was quicker than expected. The english product description is now available.
    Answer by: Baader Web Team (Admin) on Apr 3, 2017 11:24:00 AM
    Answer rated: -5
    Unfortunately the detailed description of this product hasn't been translated to english yet, we apologize. We will do that very soon. Meanwhile you could switch to the german website and use Google Translate or a similar tool.
    Unfortunately we do not have a drawing for this product. The Backfocus of 91.5mm is measured from the T-2 thread.
    Answer by: Baader Web Team (Admin) on Apr 3, 2017 9:53:00 AM
  184. Rated: 5
    1/8/2021 10:07 PM Baader FlipMirror II Star Diagonal
    I have a Vixen VMC-200L, Vixen 50mm 2" ocular (with Baader skyglow filter), a ZWO ASI183MC camera, and a ZWO ASI120MC-S camera. Along with the Baader Flip Mirror Diagonal, what components do I need to mount the ocular on the top port, the ASI183 camera on the axial port, and the ASI120 camera as an off-axis guider?

    Answer rated: -2
    This depends on the field stop position of the eyepiece and the backfocus of the cameras.
    For the eyepiece on the upper port, we'd recommend
    #2956242 M42i x 0,75-ClickLock (Astro T-2 System) with a height of 36,6mm.
    Please note that the upper port is limited by the diameter of the T-2-thread, so it is a little bit less than 40mm, and there will be some vignetting with 2"-eyepieces with long focal lengths.
    For the camera, you can use e.g.
    #2956220 SC / HD (2")-Clicklock (5" SC, 6" SC/HD, 8" SC/HD and 9¼" SC)
    with a height of 47mm.
    If I understand the description of ZWO correctly, the larger camera has 6mm of backfocus when used with either T-2 or a 2" nosepiece; the smaller camera should be similar and also include a 2" nosepiece (if doesn't, but has got a female T-thread, you can use Baader 2" nosepiece to T-2 / M48 # 2408150; if it has got only a 1.25" nosepiece, there is Baader Pushfix Reducer 2" to 1¼" # 2408151 with only 1mm of optical height).

    We'd recommend to use these two clamps and to determine the focus position of the eyepiece. You shouldn't need to insert it completely into upper port, as that clamp is shorter. If desired, you can add T-2-extensions later to get to the right distance. Or you focus your telescope now with the cameras to find out how much the focus differs between eyepiece and cameras, then you can determine the required T-2-extensions in advance.

    For connection to the telescope, we'd need to know the available thread at the telescope. T-2 or M48 work out of the box, for other threads, an adapter would be required.

    For further information, please also take a look at this blog post:
    Answer by: Baader Web Team (Admin) on Jan 11, 2021 3:54:00 PM
  185. Rated: 5
    7/11/2019 5:59 PM Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)
    I have never used a Herschel Wedge before on my refractor--always mylar film, or glass filters on the forward end of the scope.
    Will the unfiltered solar energy entering my(very expensive) air spaced triplet objective possibly damage the lens due to over heating? Could I use the wedge/and refractor continuously for 2 or 3 hours with out worry of damage to either? Thank you. Jon Mayer

    Answer rated: 5
    When you have a good refractor, all the light and also the the heat passes through the lenses and end up in the Herschel wedge. There the heat will be dissipated and the lens will be only a few degrees warmer but not really hot. So there is no danger for damage of the lens. We checked the Herschel wedge in summertime on an 8" Zeiss Refractor -.a whole day - and it survived very well.
    Answer by: Baader Web Team (Admin) on Jul 12, 2019 8:44:00 AM
  186. Rated: 5
    7/19/2019 10:48 AM 2" BDS-RT Baader Diamond Steeltrack Focuser
    Can i get one of these to fit a GT81 WIlliams Optics 2016 model?

    Answer rated: 10
    I´m sorry but we don´t have the data to how to connect our BDS-RT focuser onto this OTA. Please may ask an autorized dealer to find this out, we
    don´t sell William Oprics. So far, our adapter rings to fit the focuser on different OTA´s you can find here:

    Answer by: Baader Web Team (Admin) on Jul 19, 2019 11:20:00 AM
  187. Rated: 5
    3/29/2020 12:52 PM Laser Colli - Mark III
    I'm looking for an instruction manual for my baader laser colli mk2.
    Particually the battery's?

    Answer rated: 1
    You can find the instruction manual from the website under <downloads> or direct by this link:
    On the last page you can see that the Laser Colli needs SR41 batteries, positive side faces out.
    Answer by: Baader Web Team (Admin) on Apr 1, 2020 9:18:00 AM
  188. Rated: 5
    3/31/2020 9:03 AM Baader 2" ClickLock Diagonal Mirror
    Can a UFC be inserted between the 2" barrel nosepiece and the diagonal body (point A in this discussion: by using #2459128 and #2459120 for the telescope and camera adapters on the UFC respectively?

    Answer rated: 4
    The parts you mention should work fine to connect the UFC between the diagonal body and the 2" barrel. However, due to the threads, the end position of the UFC cannot be adjusted to your preferation, it might stop at an unfavourable position. We are thinking about developing an Camera-sided UFC adapter with S58 dovetail receptor. This would allow exact positioning to your needs. However it will take months before this product may come to the market.
    Answer by: Baader Web Team (Admin) on Mar 31, 2020 9:55:00 AM
  189. Rated: 5
    5/12/2018 10:14 PM 2" BDS-SC Baader Diamond Steeltrack® Focuser
    Do you think that 2" BDS-SC Focuser can replace the Zero Image Shift Microfocuser on 10" LX-200-ACF (GPS + AutostarII / Dated 2009) from Meade ? Or can you propose another solution with fine-focus mechanism, even it is in manual mode ? Thank you very much for your answer.

    Answer rated: -3
    Yes, the BDS-SC will work on a Meade LX-200. We actually have a testreview with images for this, unfortunately only in german language. Please use Google Translate or a similar tool to translate it. Here is the PDF:
    Answer by: Baader Web Team (Admin) on May 14, 2018 2:51:00 PM
  190. Rated: 5
    10/22/2017 5:47 PM Baader Multipurpose Finder Bracket MQR IV 9x60 finder (max diameter 72mm)
    Does the item fit a celestron C6?

    Answer rated: 13
    About the curvature at the bottom side of the standart base it allows to fit it on most OTA. Of course the C6 too.
    Answer by: Baader Web Team (Admin) on Oct 24, 2017 4:01:00 PM
  191. Rated: 5
    12/16/2019 11:20 PM Baader f/2 Highspeed-Filters (H-alpha, O-III, S-II)
    for a scope like the skywatcher esprit 100 reduced to F3.58, which narrowband filters do you think would work best ?? the high speed filters vs the 7nm vs 3.5nm filters ?

    Answer rated: 5
    Because of the small aperture and the F 3.58 ration we would recommend 7nm normal filters, not highspeed
    Answer by: Baader Web Team (Admin) on Dec 17, 2019 12:59:00 PM
  192. Rated: 5
    12/17/2019 2:16 PM BCF 1 - DSLR Astro Conversion Filter for Canon APS-C Cameras (all latest Models)
    I am going to modify Nikon D5600 for astrophotography and want to replace the stock filter with IR/UV cut filter from Badder. I want to increase the Hydrogen-alpha sensitivity. In your website I only see unmounted filters for Canon bodies. Is there any filter I can use for Nikon APS-C body ? I am fine to cut it to proper size in case your filter size is bigger. May I please request your suggestion on which one to purchase ?

    Thanks & Regards
    Diganta De

    Answer rated: 0
    None of our filters for modifying Canon cameras works for Nikon or Sony cameras. And we do not have other choices of filters to replace the original filter in the cameras of these brands. We are very sorry.
    Answer by: Baader Web Team (Admin) on Dec 17, 2019 2:33:00 PM
  193. Rated: 5
    6/7/2017 8:51 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    I see has a special edition Alan Gee Tele for SCT focuser. So can i make one with a regular Alan Gee and a regular 2"-T2 adapter.It seems the SE AG tele has a short threaded tube over AG tele compressor then the 2"-T2 over those tubes...Also if i buy SE AG from Teleskopexpress are the 2 rubber rings and metal ring sold alone if I wanted to use inside my Celestron C5 it would seem there is a middle tube missing from SE AG?Any one else sell SE AG?I just got a Baader 31mm,,very nice glass.Thanks for your time

    Answer rated: 7
    You can modify any existing Alan Gee like the TS Special Edition. The ring #1508025 is screwed into the telescope-end of the 2"-adapter #2408150, and the Alan Gee without the two spacer rings is placed between these two parts.

    We do not sell these spacer rings alone, but maybe TS has them or even includes them with their Special Edition.
    Answer by: Baader Web Team (Admin) on Jun 12, 2017 1:19:00 PM
  194. Rated: 5
    9/15/2019 12:47 PM Baader UV/IR Cut / L-Filter
    What is the height of the Baader 1 1/4 Mounted uv ir Filter in mm . thankyou

    Answer rated: 3
    The outer diameter of our 1.25" filters (including the cell mount) is 31 mm.
    Answer by: Baader Web Team (Admin) on Sep 16, 2019 8:31:00 AM
  195. Rated: 5
    8/15/2020 8:22 AM Baader Stronghold Tangent Assembly
    The clamp provided on top is for vixen universal plate correct also.called EQ? I believe with the top two peice clamp removed the Baader vario with the supplied base plate can be directly attached to the tangent. Please confirm..

    Answer rated: -1
    Yes, it is for EQ(V) style prism clamps - that is Vixen-style, which is also used by the smaller SkyWatcher EQ mounts.
    Answer by: Baader Web Team (Admin) on Aug 18, 2020 11:09:00 AM
  196. Rated: 5
    1/17/2017 3:40 AM Baader Universal Red Dot Mount (RDM) incl. Standard Finder Base
    I have a Celestron C8. There are two sets of spacing for the mounting holes, one set appears to be about 1.25 inches, the other about 1.75 (as measured between holes). Will this mount fit the smaller spacing?

    Answer rated: 9
    The holes which are 1.25 inches apart are specifically designed for that purpose, so the Baader Standard Base will fit there perfectly. The other holes are meant for an additional dove tail to mount accessories on top of the OTA. In each case, you should use only the original screws or short screws because long screws might damage the primary mirror.
    Answer by: Baader Web Team (Admin) on Jan 18, 2017 2:46:00 PM
  197. Rated: 5
    4/12/2019 2:35 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    I recently purchased both the Hyperion Mark IV zoom and Hyperion 2.25 barlow and have a question regarding set-up.

    While the box for the zoom suggests that the barlow is attached directly to the eyepiece (see caption "thread for Hyperion Barlow" and arrow pointing directly at the eyepiece), the manual ( indicates at p. 11 that "the barlow is attached onto the 1¼" nosepiece" (i.e. nosepiece between eyepiece and barlow).

    Could you please advise as to the correct set-up? Does it matter one way or the other (my preference would be not using the eyepiece but I am happy to do so if this will improve performance)?

    Many thanks in advance for responding at your very earliest convenience. Your kind assistance is much appreciated.


    Answer rated: -5
    Both ways are possible and work equally good. We recommend to attach the Barlow to the 1.25" nosepiece of the Hyperion Zoom with the Adapter A, because this is more sturdy and also works with all other eyepieces.
    But you can as well remove the 1.25" nosepiece from the Hyperion Zoom if this is better suits your needs. So, both options work equally in regards of optical performance, and you freely chose the mechanical adaption which you like better.
    Answer by: Baader Web Team (Admin) on Apr 15, 2019 10:23:00 AM
  198. Rated: 5
    9/17/2019 3:32 PM Baader MaxBright® II Binoviewer with case
    I have a Celestron Evolution 9.25 with Baader 2" BBHS ® Mirror Diagonal with 2" ClickLock Clamp. Removing the Diagonal is not easy because I have to remove first the ClickLock Clamp, due to the focuser knob position. What is the recomended acessories to use MaxBright® II Binoviewer with my Celestron?

    Answer rated: 7
    Best solution for this problem is using this adapter screwed on the Bino:
    Then you can let the BBHS onto the tube, also you´re able to mount a glaspathcorrector like this for example:
    Please take a look to the description for this corrector about the reasons why it should be used.
    Answer by: Baader Web Team (Admin) on Sep 18, 2019 12:42:00 PM
  199. Rated: 5
    7/20/2017 3:01 PM
    I wonder if your item no. 2451530, the v Dovetail clamp 70 mm, is similar to the Nexstar clamp, once made by you and sold by Alpine Astro, in short, will it fit my Nexstar GT mount or do you selle anything else that will? Thank you very much for you answer.
    Best Regards, Lars Bruhn

    Answer rated: -5
    Yes, this is indeed the same clamp and will fit your NexStar GT.
    Answer by: Tobias Baader (Admin) on Jul 21, 2017 4:48:00 PM
  200. Rated: 5
    7/16/2018 9:52 AM Hyperion Zoom 2.25x Barlow lens
    Can you tell me the full length of this Barlow with the 1.25 fitting?
    I need to source a Barlow that is short so I can achieve in-focus with a DSLR. thanks.

    Answer rated: -1
    The distance between your camera's T-ring and your focuser with inserterd Barlow is ca. 14mm, the nosepiece is ca. 2 cm long.
    Answer by: Baader Web Team (Admin) on Jul 16, 2018 10:15:00 AM
  201. Rated: 5
    5/6/2020 9:45 PM Baader U-Venus-Filter (350nm)
    How it is possible/which filter holder should I buy to mount 2" Baader filters (U Venuse filter, UV/IR cut filter) onto DLSR camera lenses with the diameter of 49 mm and 52 mm (Canon), please?

    Answer rated: 0
    This is possible with the following items:
    - Baader DSLR-2" Filter Holder M48/SP54 # 2408166
    - Baader Hyperion DT-Ring SP54/M49 for DTAdapter II&III and Hyperion Eyepieces # 2958049
    - Baader Hyperion DT-Ring SP54/M52 for DTAdapter II&III and Hyperion Eyepieces # 2958052

    The first adapter provides an SP54-thread, from which you can find adapters for most lens threads at
    Answer by: Baader Web Team (Admin) on May 7, 2020 9:33:00 AM
  202. Rated: 5
    1/2/2020 3:27 AM Baader L-RGB CCD-Filterset
    Are the Baader LRGB filter sets parfocal?

    Answer rated: 5
    Yes, all filters of a set have the same thickness (usually 2mm for filters in a filter cell and 3mm for filters withoiut filter cell).
    Answer by: Baader Web Team (Admin) on Jan 7, 2020 3:00:00 PM
  203. Rated: 5
    8/29/2020 6:19 PM Baader T-Ring Canon EF (EOS) to T-2
    Is it possible to replace the 42mm thread with the 48mm spacer # 2458405, so I could use this correctly with the MPCC? All your recommandations are about using the protective Canon ring but I have no real need for it since I don't use much filters. There is a question similar to mine but as an answer you refer to a graph of the MPCC which doesn't give me the answer I need... Thanks for your help!

    Answer rated: -2
    Unfortunately, the spacer ring has got a diameter of 52mm. The inset of our Canon ring has got a diameter of only 50mm.
    Answer by: Baader Web Team (Admin) on Sep 2, 2020 1:40:00 PM
  204. Rated: 5
    9/3/2020 5:49 AM Baader FCCT (Filter Changer Camera Tilter)
    Will there be filter slides available for mounted 1.25" and 2" filters such as the f/2 highspeed filters?

    Answer rated: 0
    No, there is not enough backfocus available for a filter cell and a filter drawer.
    Answer by: Baader Web Team (Admin) on Sep 3, 2020 8:13:00 AM
  205. Rated: 4
    12/11/2020 10:11 PM 2" BDS-SC Baader Diamond Steeltrack® Focuser
    Buenas noches
    El Enfocador Diamond Steeltrack® Baader BDS-SC de 2 ", es compatible con un Mac de 180 y un steeldrive II

    Answer rated: 4
    Diamond SteelTrack focusers and SteelDrive II focus motors are compatible.
    If you Mak has got an 2" SC-thread (outer diameter 50,2mm), the SteelTrack should fit, it is an 2" 24 thread (60°) - you can find out about measuring a thread here:
    Answer by: Baader Web Team (Admin) on Dec 14, 2020 12:56:00 PM
  206. Rated: 4
    9/1/2016 12:13 PM 2" BDS-SC Baader Diamond Steeltrack® Focuser
    I want to mount my BDS-SC on c11 celestron. So I wanted to move the “reducer-adapter SC/HD 3.3 UNF to SC/HD 2 UNF”. How proceed, unscrew it? with what kind of tool? (I don’t want to damage it)

    Answer rated: 0
    i have succeeded to remove the adapter. thank you
    Answer by: alain thiry on Sep 1, 2016 12:47:00 PM
  207. Rated: 4
    6/16/2020 4:08 AM Mark V Großfeld (Giant)-Binocular
    What are the recommended accessories for using Mark V with a Celestron 9.25?

    Answer rated: 1
    We have described several adaptations in the manual which you can find in the download section of the MaxBright Binonoviewers website. For an SC, you basically only need a nosepiece. We also recommend a Glasspath Corrector 1.25x, although it is not absolutely necessary - but at higher magnifications, it removes the colour aberrations which may be visible even at an f/10 telescope.
    You can find sets with nosepiece and GPC here:

    Please make sure that you have a sturdy eyepiece clamp. For a compact adaptation, we also recommend a TZ-2 star diagonal which can be attached directly to the binoviewer, but reaching focus is no problem with a Schmidt-Cassegrain.
    Answer by: Baader Web Team (Admin) on Jun 16, 2020 10:41:00 AM
  208. Rated: 4
    9/16/2020 5:19 PM StarAid Revolution Standalone Autoguiding - Revision A
    Is the StarAid app available for iPhones or iPads? I cannot find it anywhere.

    Answer rated: 3
    It is a web application on the star aid. You just need to connect your device to the StarAid's WiFi access point, then you can use any modern browser, no matter if on smartphone, tablet or laptop/computer.
    Answer by: Baader Web Team (Admin) on Sep 17, 2020 9:13:00 AM
  209. Rated: 4
    6/28/2020 11:11 PM Baader T-2 / 90° Baader Roof-Prism with BBHS ® coating (T-2 part #02)
    Regarding the quality of visual observation, is there any difference between this T2 Roof prism (2456130) and the 2" Astro Amici Prism (2456120)?

    Answer rated: 1
    Both of our Astro-Amici Prisms are produced with the same specifications. There is no difference in the quality of visual observation - the only difference is the size.
    Answer by: Baader Web Team (Admin) on Jun 29, 2020 10:30:00 AM
  210. Rated: 4
    2/8/2020 4:58 PM Filter cell 2" Low Profile, 6mm height
    What has to be the maximum and minimum diameter of an unmounted filter in order to properly fit into the filter cell 2" low profile? Is a 50mm diameter filter going to be suitable to be mounted in your 2" filter cell? Thank you.

    Answer rated: 6
    Unfortunately a 50 mm filter will not fit into our cells because the connecting male/female (standard) threads measure 48mm as outer diameter - and consequently the female side must be smaller then that in clear diameter, otherwise filter cells could not be combined. Accordingly the largest glass diameter could be 47.5 mm and the smallest possible size would be 46.5 mm, whereas this already will be problematic because the filter substrate will need some camfer (ground bevel) in order to protect the glass from chipping. So in reality the filter should not be smaller than 47 mm.
    Answer by: Baader Web Team (Admin) on Feb 17, 2020 11:11:00 AM
  211. Rated: 4
    2/8/2020 7:10 PM Baader Hyperion Universal Zoom Mark IV, 8-24mm eyepiece (1¼" / 2")
    I want to connect the Hyperion 8-24mm Mark IV zoom to my Nikon D5600. I don't see a specific Nikon T-ring converter. What do I need to connect the eyepiece to my camera? Thank you.

    Answer rated: 4
    We do have four different Nikon T-Rings for different camera models:

    Regarding required extensions, we highly recommend to look at our Digiscoping Instruction Manual:
    Answer by: Baader Web Team (Admin) on Feb 10, 2020 8:45:00 AM
  212. Rated: 4
    9/4/2018 11:00 AM Baader T-2 Stardiagonal (Zeiss) Prism with BBHS ® coating (T-2 part #01B)
    Dear Baader for my dobson 18' f4 do you suggest to use the T2 zeiss prism diagonal or the T2 mirror? I mostly observe planets hires more then deep sky objects. I was thinking to prism due to future binoviewer but I heard prism could be an issue on a fast f4 scope for bad correction

    Answer rated: 5
    For a Dobsonian, we would recommend no star diagonal at all - usually, they are too long, so that you will not be able to reach focus. If you want to use a binoviewer at a Newtonian telescope, we'd strongly recommend
    2" Glasspathcorrector® 1,7x for Newtons # 2456300
    2" Glasspathcorrector® 1,7x for Newtons incl. T-2 change ring # 2456301
    The only difference between them two is the adaptation to the binoviewer. They save ca. 80mm of glass path; a binoviewer consumes ca. 110mm, so you need only ca. 30mm of additional backfocus compared to a normal eyepiece without binoviewer.

    Otherwise, we'd recommend using mirrors on a mirror telescope to avoid possible colour abberations which can be caused by a prism.
    Answer by: Baader Web Team (Admin) on Sep 5, 2018 8:54:00 AM
  213. Rated: 4
    10/12/2016 9:30 PM Baader 2" BBHS ® Prism Star Diagonal Prism with 2" ClickLock Clamp
    What is the outside diameter of the nose piece? The precise inside diameter of the focusing tube on my refractor is 2.000 inches at 20 degrees Celsius +/- 0.001 inches. If it turns out that the nose piece is also exactly 2 inches, I could turn the nosepiece on a lathe. Your thoughts? What nose piece diameter would you suggest, if I had to turn it on a lathe?

    Answer rated: 3
    the outside diameter is 2" - equal to 50.8 mm (- 0.05 / -0.1 mm).
    We strive to have this fit into any 2" standard eyepiece holder and had no problems so far (we do this for quite a while).
    Answer by: Baader Web Team (Admin) on Oct 13, 2016 8:20:00 AM
  214. Rated: 4
    3/5/2018 2:55 PM Baader Wide-T-Ring Sony E/NEX Bayonet with D52i/M48 to T-2 und S52
    Hi there - I'm a little confused - in the description at the top it says that from the front support surface to the image plane of the camera, this represents 55mm. However, this ring is only meant to add 8.3mm to the 18mm backfocus of e-mount cameras. That would give a total backfocus of my question is if I want to connect my e-mount camera to the back of a field flattener which requires 55mm backfocus, is this adapter enough, or do I need to add approx 28.7mm of spacers? Thank you and sorry for the long question.

    Answer rated: 8
    Because of a mistake by translation our description of the Item was wrong. You´re right when you say that the back focus length is 26,3mm
    (-E- for eighteen milimeter from the camera body plus 8,3mm from the E-bayonet ring) You can increase this length with this rings:
    You need 28,7mm more distance to reach the well known 55mm DSLR distance back focus. Please hold in mind that 2mm thick filter
    will lay out the focus point of about 0,7mm extrafocal. Also please notice that T2 rings will obstruct the image corner of full format sensores.
    Answer by: Baader Web Team (Admin) on Mar 6, 2018 8:51:00 AM
  215. Rated: 4
    10/4/2020 4:12 AM Baader 2" ClickLock Diagonal Mirror
    I have a Celestron Nexstar 6SE SCT. Is the 2” diagonal compatible? Do I need adapters, which one?

    Answer rated: 0
    Unfortunately this will not work properly as the housing of the mirror may hit the bottom the mount base when slewing. And the diameter the field of View is smaller than 2" so that you cannot take advantage on this big mirror on the small telescope.
    Answer by: Baader Web Team (Admin) on Oct 5, 2020 4:01:00 PM
  216. Rated: 4
    3/15/2018 6:12 PM Telecentric System TZ-2 (2x focal length)
    Is it possible to combine the tz-2 + tz-4 with the Daystar Quark combo?

    Answer rated: 14
    We have not tried if this works and we cannot guarantee it. The Quark already has a built in TZ. Mounting another focal enght extending lens systems in a row with the built in TZ may lead to trouble reaching the focus and it may degrade the image. Furthermore such a high magnification leads to a very dark sun
    Answer by: Baader Web Team (Admin) on Mar 16, 2018 9:28:00 AM
  217. Rated: 4
    7/9/2020 3:08 AM Baader T-Ring Canon EF (EOS) to T-2
    If I use this with a Canon EOS 5D Mark IV will it work with my telescope's field flattener which has 55 mm of back focus without any other T-2 system parts?

    Answer rated: 5
    Yes! The optical length of the camera is 44mm and this bayonet ring is 11mm so you get the needed 55mm back focus.
    Answer by: Baader Web Team (Admin) on Jul 9, 2020 9:07:00 AM
  218. Rated: 4
    4/20/2017 6:45 PM Baader Stronghold Tangent Assembly
    I just received a Baader Stronghold Tangent. I cannot remove the locking dowel it's holder. What is the proper way to remove the locking dowel from its holder?

    Answer rated: -8
    The locking dowel should be removable with light force. Alternatively you could loosen the M4 headless set screw a bit, which is hold the locking dowel. You can access it from the side
    Answer by: Baader Web Team (Admin) on Apr 21, 2017 9:39:00 AM
  219. Rated: 4
    7/11/2020 11:55 PM Alan Gee Telecompressor Mark II (T-2 part #20)
    The telecompressor slides into the baffle of my Celestron 8SE SCT but is not secure and slides out. I use a 2" Baader Click-Lock and a 2" nose piece that attaches to my OAG. There is nothing securing the telecompressor inside the baffle. How can I make sure it does not slide out?

    Answer rated: 7
    This is tricky as the Alan Gee is meant to be held in place by a T-thread.

    If you have got one of our 2" star diagonals, you can attach it as described on page 7 of the manual, with
    Baader Expansion Ring 2"a/T-2i with 1mm optical path length (T-2 part #28) # 2958242
    Baader 2" / T-2 Nose Piece and Camera adapter (T-2 part #16) # 2408150

    It should also be possible to remove he Clicklock, clamp the UAG in the telescope with Baader Reducing-Ring 2"i / T-2a, with 1.5mm optical length
    # 2958244 or Baader T Adapter (BTA) for SC and MAK Telescopes (T-2 part #21) # 2408160 and expand the thread again to SC for the Clicklock with 2"a / T-2i Zero-length reducing piece (zero optical length) # 2454833 - but please always remember that the reducing factor depends on the distance between the Alan Gee and the eyepiece.
    Answer by: Baader Web Team (Admin) on Jul 13, 2020 3:04:00 PM
  220. Rated: 4
    11/20/2019 1:57 AM BCF 1 - DSLR Astro Conversion Filter for Canon APS-C Cameras (all latest Models)
    Does this filter work for a Canon 4000D?

    Answer rated: -3
    Yes, this will fit
    Answer by: Baader Web Team (Admin) on Nov 26, 2019 2:46:00 PM
  221. Rated: 4
    3/8/2020 1:18 PM Baader Full-Frame CCD Narrowband-Filterset I (H-alpha 7 / OIII / SII)
    how can you see which side of the filter should go to the telescope in the filterwheel and which side to the camera - unmounted filters 36mm

    Answer rated: -3
    We have this in our FAQ:
    Always put the more reflective side towards the telescope side. To guide you we already put a small arrow on the filter rim, on those filters were the position matters. This arrow indicates which face of the filter should be directed towards the sky (telescope-sided). All cell-mounted filters are already oriented in a way that the most appropriate filter face is facing the sky when the filter would be mounted directly onto the front end of the nosepiece of a camera.
    If you mount your filter the other way, any reflected light would have a short way to the camera sensor, resulting in a higher risk of getting some kind of back-reflections inside the camera field. Many sensors have highly reflective areas near to the light sensitive area, also the area with the bonding contacts is sometimes highly reflective.

    But: this is true only for instruments without optical elements near to the focal plane. If you have f.e. a coma corrector, field flattener, focal reducer, focal extender (to a lower degree due to concave surface), or in extreme cases a whole lens group for more complex field corrections a few centimeters in front of the filter it could be useful to flip the filter against the rule from above (thus having the arrow pointing away from the telescope). Cause in such cases the likelihood of reflections from the sensor could be lesser then fort- and back- reflections from such glass-surfaces. If in doubt, it helps to make some test images from a star field with bright stars, using the filter in both ways for comparison.

    Should you really have some reflections with both positions it can be more effective to add a spacer between filter and camera, eventually shifting the reflection out of the image field. With focal correctors having curved surfaces changing the filter-lens distance could help also.
    Answer by: Baader Web Team (Admin) on Mar 11, 2020 8:25:00 AM
  222. Rated: 4
    3/12/2020 9:21 PM 2" MPCC Mark III (Multi-Purpose Coma Corrector for Newtons)
    Can the MPCC be used with the Hyperion Zoom 2.25x Barlow lens for imaging? I can use the Focusing Eyepiece Holder and Varilock combination to connect them, but will this actually work and if so, what length should I set between the MPCC and Barlow?

    Answer rated: -2
    The MPCC is an tool for Deep Sky photography with Newtonian telescopes. It not designed for use with an Barlow lens that you normally use for high power photos or visual observations mainly of Solar System objects. The barlow lens would magnify the middle of the field wich is mostly coma free anyway. We suggest to work with the Hyperion Zoom and Barlow lens and without MPCC.
    Answer by: Baader Web Team (Admin) on Mar 13, 2020 2:40:00 PM
  223. Rated: 4
    3/31/2020 12:29 AM Baader MaxBright® II Binoviewer with case
    I have a Celestron 1100 Edge HD, will this Binoviewer work with that? And if so, what accessories will I need?
    I also have a 70mm SolarMax III. Will I be able to use it with that? Again what accessories will I need?

    Answer rated: -2
    Its hard to answer this question in general. Yes, the MaxBright II Binoviewer will work with an Celestron 11" EdgeHD. But there are many ways to adapt it. Most (if not all) customers will use a Binoviewer on a SC telescope in combination with a star diagonal. There are many different star diagonals available (or even our Baader FlipMirror II) and many possible ways to adapt it. We recommend that you look at our extensive 24-page manual, which illustrates many possible adaptation options and required adapters:

    Furthermore we recommend to take a look at our PDF: Manual and Recommended Use of Baader Star Diagonals (T-2 and 2"):

    Unfortunately we don't sell the SolarMax III and don't know its thread sizes and most of all the available backfocus (but we strongly assume that it is very much too small). So we cant comment here on required accessories or functionality.
    Answer by: Baader Web Team (Admin) on Apr 2, 2020 2:29:00 PM
  224. Rated: 4
    8/23/2019 7:13 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    I have a Zeiss Telementor telescope with a Zeiss M44 prism diagonal. I want to use 2" eyepieces with my diagonal. Can you supply a 2" click-lock eyepiece holder with a male M44 thread connector?

    Answer rated: 3
    This is possible by combining our 2" / T-2 ClickLock #2956242 with our M44 / T-2 Zeiss adapter #1508005
    Answer by: Baader Web Team (Admin) on Aug 26, 2019 8:44:00 AM
  225. Rated: 4
    3/17/2019 11:03 AM Baader UFC S70 / SP54 (m) Telescope-Adapter (optical height: 1 mm)
    What is SP54 thread compared to M54, and can they interchange??

    Answer rated: 1
    The Special thread 54 has another pitch than the common metric M54 threads. The pitch is 0.7 mm - an approximation of a US-norm of ancient days "step-down rings"- which was quite common. And even then, M54 is not clearly defined - some manufacturers use pitch 0.75, others use pitch 1 mm in order to make their parts unusable for others - it´s a mess.
    Answer by: Baader Web Team (Admin) on Mar 18, 2019 4:01:00 PM
  226. Rated: 4
    11/3/2017 4:14 AM Baader T-2 Stardiagonal (Zeiss) Prism with BBHS ® coating (T-2 part #01B)
    Does it make sense to use a T2-2" clicklock on this for a 2" eyepiece? Or it's better to just use 1.25" clickclock and eyepiece given the connection interface size is only T2.

    Answer rated: 9
    The aperture of the housing/prism is 34mm. You can use 2" eyepieces up to 34mm free aperture on
    the telescope side, these will be fully illuminated. If you have 2" eyepieces with a wider aperture than 34mm
    you will see that the field is vignetted.
    Answer by: Baader Web Team (Admin) on Nov 3, 2017 10:17:00 AM
  227. Rated: 4
    11/16/2018 10:39 PM Baader 2" ClickLock eyepiece clamps (from T-2 to 4,1")
    Is there a Clicklock clamp available for the following refractors?
    - Tele Vue 85 mm APO Refractor
    - Tele Vue NP101is Nagler-Petzval APO Refractor
    - Tele Vue NP127is Nagler-Petzval APO Refractor

    Thank you!

    Answer rated: 14
    There are no ClickLock Clamps available that fit directly on the focuser of the TeleVue Refractors. We recommend to use a 2" diagonal with 2" clamp like our 2" BBHS mirrors wich meet the quality of these high end refractors.
    Answer by: Baader Web Team (Admin) on Nov 19, 2018 10:24:00 AM
  228. Rated: 4
    6/6/2018 8:49 AM Baader 45 ° Maxbright Amici prism 1¼ "with built-in 2x glass path corrector
    May I please ask why this will not work with the Grossfeld Mark V Binoviewers with a quick changer ? Is it because of the weight of the Binoviewers ?

    Answer rated: -6
    You can actually use the MaxBright Amici with the Großfeldbino, too, but we do not recommend it - the quality is not on the same level as the Bino-viewer.

    The Amici has got small prisms, so you'd have a smaller field of view, and - most of all - it is only designed for terrestrial observations at magnifications of no more than 80x, just like most spotting scopes

    To make use of the quality of the Grossfeldbino, you should use a seperate glasspath corrector and either a T-2-prism (for the shortest possible connection) or an Amici which is designed for astronomical use like #2456130 (Baader T-2 / 90° Baader Roof-Prism).
    Answer by: Baader Web Team (Admin) on Jun 6, 2018 10:57:00 AM
  229. Rated: 4
    11/15/2020 4:08 AM Baader UV/IR Cut / L-Filter
    Can this be used with M48 extension tubes e.g. when getting a particular spacing and including UV/IR cut filter?

    How thick is the filter excluding the male thread e.g. 8mm or 10mm?

    When calculating thickness how much thickness can be subtracted e.g. filter is 2mm or 3mm thick and light path is reduced by a percentage of this.

    As an example, I have an 30mm M48 extension tube. If I include this filter, how much path length does the filter take e.g. I also require a 20mm M48 to make an equivalent path length.

    I have a ZWO camera and a ZWO T2 - M48 adapter with zero path length. I plan to screw this adapter into the UV/IR filter (how deep is the female thread) and attach this to my camera's T2 male thread.


    Answer rated: 0
    The filter cell is cmopatible with M48 extensions, but it is not the same thread, as there are various 2" filter threads, and we have designed our filter cells to work with most eyepieces. So, it will work, but we wouldn't recommend it for highest payloads, and please check how good it fits.

    Most of our filters use low-profile filter cells with 6mm height (excluding the threads), the higher 8mm filter cells can mostly be found on older second-hand filters.

    The filter glass adds approximately 1/3 of its thickness to the optical path. So, a 2mm filter will move the focus ca. 0.66mm outwards.
    Answer by: Baader Web Team (Admin) on Nov 16, 2020 11:37:00 AM
  230. Rated: 4
    8/16/2020 1:48 PM Baader MaxBright® II Binoviewer with case
    I have a Bresser AR127L telescope, I just went ahead a minute again and bought a MaxBright II binoviewer without accessories. So from a newbie question here, what other accessories and eye piece do I need to set it up on my Bresser telescope. Can I use a 2” eye piece as well instead of the 1,25”?. Sorry, am clueless on Binoviewer.

    Answer rated: -1
    Please take a look at the manual of the MaxBright binoviewer, where most of your questions are answered. It is in the download section of the proct website. Take a special look at the section about how to determine the back focus of your telescope, which tells you if you need a glasspath corrector to reach focus, anf if you can use your existing star diagonal or if it is too long. This determines if you need a 1.25" T-2 nosepiece, or if you need a very short star diagonal with T-2-threads instead of a long eyepiece clamp.

    You can only use 1.25" eyepieces, although our Hyperion Aspheric 2" eyepieces come with adapter so that they can be used as 1.25" eyepieces - if there is sufficient back focus.

    We always recommend to measure your available backfocus first (with your existing star diagonal, but if possible also without it), so that the necessay adaption can be found - often, there are cheaper sets availableht an if you have to buy every item seperately.
    Answer by: Baader Web Team (Admin) on Aug 17, 2020 2:05:00 PM
  231. Rated: 4
    8/16/2020 10:15 PM Baader Ultra-Narrowband H-alpha 3,5nm Filter
    Can you share actual transmission characteristics? Does this filter allows NII wavelength to pass?

    Answer rated: -3
    This filter is fully blocked from 390 to 1150 nm. It will not pass N II.
    Answer by: Baader Web Team (Admin) on Aug 18, 2020 12:34:00 PM
  232. Rated: 4
    11/30/2018 12:53 AM Zeiss-Diascope Bayonet 1¼" eyepiece adapter
    Will this adaptor also fit a Leica Apo Televid 77 - silver version?

    Answer rated: -4
    Zeiss Bayonet and Leica Bayonet are different so it will not fit
    Answer by: Baader Web Team (Admin) on Nov 30, 2018 8:27:00 AM
  233. Rated: 4
    5/20/2020 9:14 PM Baader Color Filter-Set Moon and Planetary (6 colors)
    Does the 2" Filter Set (2458310) come with six of your stackable filter cases (2459253)? The picture of the set on your website shows non-stackable clamshell cases which may just be an old photo. I just want to me sure if I order the set from USA distributor Alpine Astronomical (SKU: FCFS-2) that it will come with the stackable filterboxes. Thanks!

    Answer rated: 2
    Yes, the 2" filter set does come with our stackable filter cases. It is correct that the picture on our website was outdated, apologies. We have removed it from the product page.
    Answer by: Baader Web Team (Admin) on May 25, 2020 1:27:00 PM
  234. Rated: 4
    8/18/2020 8:35 AM Baader UFC (Universal Filter Changer)
    Is this slider compatible with baader highspeed 2" mounted filters? Can`t find exact height figure for them.

    Also, I have 6,5 backfocus camera, what additional spacers would I need for slider with RASA 8? And is use of dedicated Adapter is obligatory in this case, or T2 female part on telescope side will do the job?

    Answer rated: -1
    The highspeed-filters have the Low-Profile Filter Cell with 6mm height, as most of our current filters, and fit into the UFC filter chamber.

    For the RASA 8, you need
    - Baader UFC S70 RASA 8" Telescope-Adapter (optical height: 1.4 mm) # 2459136
    - Baader UFC Base (Filter Chamber) telescope-sided S70 dovetail receptor (optical height: 13 mm) # 2459110
    - Baader UFC T-2 (m) Camera-Adapter (optical height: 2 mm) # 2459115
    The camera adapter depends on the camera you want to use. If T-2 is wide enough so that it doesn't cause vignetting, you can use T-2 without problems.

    The length of this setup is 16.4mm, so the remaining backfocus of the RASA 8 is 12.6mm. To bridge this gap, you can combine several adapters, e.g.
    - Baader UFC S70 Extension 5mm # 2459141
    - Baader T-2 / 7.5 mm Extension Tube (T-2 part #25C) # 1508155

    This gives you 12.5mm and is within the tolerances of the RASA 8. We also have T-2 Fine-Adjustment rings (0,3 / 0,5 / 1 mm) - Aluminium #2457910 (also available seperately)
    Answer by: Baader Web Team (Admin) on Aug 18, 2020 10:24:00 AM
  235. Rated: 4
    4/29/2019 8:24 PM Baader 5mm Hyperion 68° Modular Eyepiece
    I have a Zeiss Diascope 85T and would like to attach the Baader Planetarium Hyperion 5 mm 1.25" Eyepiece - HYP-5 #2454605 using the Baader Zeiss Diascope Bayonet 1.25" Eyepiece Adapter - DIA-BAYO #2454500. However, your Hyperion eyepieces application examples file (download) does not list HYP-5 as compatible with the Zeiss spotting scope with 1 1/4 inch adapter.
    From your document - Visual Observation:
    The Hyperion 21-/17-13-/8 mm eyepieces may be adapted to the Zeiss spotting scope with the aid of a bayonet-adapter #2454500.
    Can the HPY-5 also be adapted to the Zeiss Diascope 85T with 1 1/4 inch adapter (2554500)?

    Answer rated: 14
    Unfortunately, the 5mm Hyperion (and the old 3.5mm) does not work with the Zeiss Diascope. The eyepiece fits mechanically, but you can't focus to infinity.
    Answer by: Baader Web Team (Admin) on Apr 30, 2019 8:16:00 AM
  236. Rated: 4
    7/17/2018 11:09 AM Baader Q-Barlow 2.25x / 1.3x
    Dear Baader I have the q-barlow but the screwed into the eyepiece directly for 1.3x magnification is possible with any brand\kind of eyepiece or just with your classic orthos?

    Answer rated: -9
    The 1.3x configuration works with every 1.25'" eyepiece which has got a standard filter thread and an empty barrel - it is inserted ca. 15 mm deep into the eyepiece, this much space must be available.

    There are eyepieces which already have a built-in kind of barlow element inside of the 1.25" barrel, here you can't insert the Q-Barlow.
    Answer by: Baader Web Team (Admin) on Jul 18, 2018 8:14:00 AM
  237. Rated: 4
    6/3/2020 10:34 AM Baader 2" to 1¼" ClickLock Reducer (T-2 part #15B)
    I also have a Celestron Evolution HD 8 telescope. My diagonal is 1.25 inches. Can I install the 2 inch Clicklock as the telescope’s new visual back, immediately followed by the 2 to 1.25 inch Clicklock Reducer, then my 1.25 inch diagonal (regular non-Baader)?

    Answer rated: 2
    Yes, no problem - all standard 2" accessories fit into the 2" ClickLock, and all 1.25" accessorieries fit into the 2"/1.25" reducer.
    Answer by: Baader Web Team (Admin) on Jun 3, 2020 10:39:00 AM
  238. Rated: 4
    1/7/2018 12:49 AM Mark V Großfeld (Giant)-Binocular
    What is the total light transmission of this binoviewer?

    Answer rated: -17
    Please excuse, there is no answer to this question. What do you mean by "total light transmission"? The incoming light is split into two channels - evidently the light in both channels appears to be notably dimmer when you close one eye at a time and try to judge the brightness in each channel separately. What does not come into play during such kind of "fake-evaluation" is "the power of the human brain".
    It happens "in the brain" that both light trains become reunified. And what actually happens there is that the image all of a sudden does NOT look dimmer but that fine detail and most subtle color differences within planetary surfaces become recognizable much easier and that observation happens effortlessly without fatigue - even when observing over a long time. Regardless of light throughput - the real virtue of a binocular viewer does lie in the optical quality of the glass and utmost care in optical surface polish, in perfect angle orthogonality of each prism, an immaculate beam splitter quality, highest degree of optical adjustment of all optical elements at any interpupillary distance - and only lastly: utmost coating quality. These are the most necessary criteria (in this order) for supporting an undeteriorated viewing experience with both eyes - even at highest magnification work. So - whatever anyone else is claiming - the Mark V has the best light throughput and the highest quality prism surfaces and adjustment - and and and - of any commercial astro-binocular viewer in the market.
    Answer by: Baader Web Team (Admin) on Jan 11, 2018 8:27:00 AM
  239. Rated: 4
    12/30/2018 11:30 PM Baader Neodymium (Moon & Skyglow) Filter
    I have a unmodified Canon 60D for astrophotography. I image from a light polluted backyard and was looking for a light pollution filter to use. Would you recommend this or another filter for that purpose? I will be upgrading to a cooled mono CMOS camera in the near future and want the capability of a 2inch filter for both the CMOS and DSLR.

    Answer rated: 15
    The filter is suited for both cameras.
    Answer by: Baader Web Team (Admin) on Jan 29, 2019 10:39:00 AM
  240. Rated: 3
    10/22/2019 4:24 PM FLI's Color Filter Wheels
    what is the thickness of the unit of the 2" square filter unit with 5 filters
    I need to know extra back focus introduced
    Is there a mechanical drawing online

    Answer rated: 1
    You find the drawings of the filter wheels on when you click on "Colour wheel specification" and then on the little pdf logo "Download Drawing"
    Answer by: Baader Web Team (Admin) on Oct 23, 2019 9:00:00 AM
  241. Rated: 3
    5/18/2019 1:55 PM Baader Hyperion DT-Ring SP54/M46 for DTAdapter II&III and Hyperion Eyepieces
    Could you please let me know if this is the correct and only item I would need to mount your 2” filter on a camera lens with a 46mm front thread?

    Answer rated: 1
    You will need this adapter, but in addition also our 2" Filter holder M48/SP54
    Answer by: Baader Web Team (Admin) on May 20, 2019 8:55:00 AM
  242. Rated: 3
    9/6/2020 12:14 AM Baader M48 Spacer Ring for MPCC III / Protective EOS T-Ring
    Do you have a similar product that goes from M48 to M48 with 2 mm length? I need to use it when I take off the 2 mm from the Baader MPCC M42 choke. Cheers!

    Answer rated: -1
    We do have M48 spacer rings which ca be inserted between to parts with M48-threads. But I woudn't recommend stacking two 1mm-rings if the thread is too short.
    Answer by: Baader Web Team (Admin) on Sep 7, 2020 11:17:00 AM
  243. Rated: 3
    8/9/2018 2:58 PM Baader GP-Tripod/Pillar-Adapter Flange for Cel-AS/ EQ-5/HEQ5
    Will this allow also fit the Celestron AdvancedVX mount?

    Answer rated: -3
    Unfortunately the AVX has another foot than AS-GT and other mounts, therefore this adaptor will not fit.
    Answer by: Baader Web Team (Admin) on Aug 9, 2018 3:32:00 PM
  244. Rated: 3
    9/9/2020 2:01 PM Carl Zeiss 1¼" Abbe Barlow lens 2x
    Dear Sir,
    I use a Baader T-2 prism diagonal with a 1,25" clicklock eyepiece adapter.If I insert the Zeiss Abbe barlow lens into this clicklock will this not hit the prism inside the diagonal? I ask because the 1.25" sleve of this barlow seems much longer than the 1.25" clicklock eyepiece adapter I use??
    Thank you very much!
    Best Regards

    Answer rated: 2
    It is indeed too long - the lens is about 12mm longer than the top of the T-thread.
    If you want to use it with a 1.25"-prism, you could use
    Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154
    Answer by: Baader Web Team (Admin) on Sep 9, 2020 4:15:00 PM
  245. Rated: 3
    8/14/2018 2:46 PM Rubber/Metal foldable Morpheus® eyecup (M43-threaded)
    Is a dust cap (end cap) included with this eye cup?

    Answer rated: 2
    No. A dustcap is not included with the Rubber/Metal foldable Morpheus eyecup.
    Answer by: Baader Web Team (Admin) on Aug 14, 2018 2:56:00 PM
  246. Rated: 3
    9/13/2020 2:57 AM Baader Ultra-Narrowband H-alpha 3,5nm Filter
    What bandwidth is recommended for H-alpha imaging at f/15?

    Answer rated: 5
    We recommend 7nm so that exposure times will be acceptable
    Answer by: Baader Web Team (Admin) on Sep 14, 2020 11:58:00 AM
  247. Rated: