Please mention the reference surface which is the determining factor.
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
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...
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.
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.
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.
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.
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.
- Hyperion / Morpheus T-Adapter M43/T-2 #2958080
- 1" C-Mount T-2 adapter Filterholder #2958520
And spacers between these two adapters, depending on the size of your sensor and the desired effective focal length. The larger the sensor, the farther away should it be from the eyepiece to avoid distortions at the edge of the image.
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 (https://www.baader-planetarium.com/en/downloads/dl/file/id/356/product/3117/description_and_recommended_accessories_for_the_hyperion_universal_zoom_mark_iv.pdf) 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.
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.
2) the vendor said the 2" is only for ease of use. You get no advantage of using the 2" re more light gathering. Is this true?
3) If #2 is true then you do not buy 2" filters with this eye piece
4) you do not get the normal "space walk" feel of the 2" with this eye piece if #1 is true so you might as well buy a 1.25 zoom or a 2" dedicated zoom if you want that 2" feel?
If you remove the 1.25" nosepiece, you'll see a smooth hull with a diagonal slit - this is a part of the zoom mechanism. The lenses inside can not be removed without destroying the eyepiece, only the smooth hull can be removed to attach the eyepiece to some spotting scopes.
2 & 4) This is true. 2" nosepieces are only interesting for eyepieces with longer focal lengths than ca. 32mm - the true fields of view (the part of the sky which you can overlook) of eyepieces with smaller focal lengths always fit into 1.25" nose-pieces. There is no advantage in using 2"-lenses at 24mm, even less at 8mm.
Please note that the space walk feeling is only an effect of the apparent field of view of an eyepiece. To achieve it, you need an apparent field of view of about 76° like with our Morpheus, where you can still see the edge of the field of view, but it starts to dissappear when you observe for some time. The Hyperion Zoom has got a smaller apparent field of view, so you'll still notice the edge. But please compare its field of view to that of other zoom eyepieces! Especially note that the apparent field of view increases with higher magnification, while many other eyepieces show a smaller field of view at high magnification.
Basically, it is a 1.25" zoom with an included 2" adapter, because a 2" eyepiece in this focal range wouldn't make any sense. But the 2" housing provides more stability, especialy if you attach a camera to the eyepiece. I don't know of any 2" eyepieces at all.
3) We'd recommend always 2"-filters, because you use them also with 2"-pieces for lower magnifications, or mount them inside of a 2"/1.25"-reducer, so that you can change 1.25"-eyepieces without changing the filter. But if you look only at this eyepiece, yes, there is no difference if you use 1.25" or 2" filters.
To prevent dark corner on the images of a full format sensor the 40mm extension increases the distance. Otherwise the exit pupil
of the eye piece is too close to the sensor and you get images similar to fish-eye prime lenses that shows only an Illuminatet circle.
Please refer page 4 of this document which shows even more possibilities like quick-changer etc.
For your purpose you can handle the zoom eye piece like the shown Morpheus.
I have a Hyperion Universal Zoom Mark IV. Can I get an adapter for my Optolyth APO TBG 100 HDF ?
spective to let you know if our zoom eye piece may is matching with it. You can see our technical specifications here:
- T-Ring for your camera, for Canon: Baader T-Ring Canon EF (EOS) to T-2 # 2408319
- 30mm T-2 extension tubes or longer, e.g. 2x Baader T-2 / 15 mm Extension Tube (T-2 part #25A) # 1508154 or one 15mm-tube and a T-2-Quickchanger (either Baader TQC/TCR Heavy duty T-2 Quick Changing System (T-2 part #06A & #07) # 2456322 or Baader Complete T-2 Changer System (T-2 parts #06 & #07) # 2456321)
- Baader Hyperion T-Adapter M43i / T-2a (M42x0.75) # 2958080 to equip the eyepiece with a T-2-thread
We have also described the adaptations (including formulas to describe the calculation of the magnification) in this PDF:
and in page 8 of the manual of the Hyperion Zoom at
- 40mm for full frame DSLR
- 30 mm for APS-C
- ca. 15mm for MFT
These values are from experience; longer distances will give you a higher magnification and a darker imager; shorter distances will show distortions in the edge. But we do not have a formula for this, it depends a bit on the eyepiece. But usually, these distances will provide good pictures.
All possible adaptations are also listed in this PDF:
Thank you, Vit
For Zeiss Diascope and the Mark IV Zoom, you need #2454831.
DetailsContinous magnification with ClickStop at 8/12/16/20/24 mm
The Hyperion Universal Zoom Eyepiece can be adjusted steplessly from 8 to 24 mm of focal length. In addition focal lengths 8 / 12 / 16 / 20 / 24 mm are marked with „ClickStops“, so that any of these five magnifications can be set intuitively. This is especially of importance for use with binoviewers.
Two Mark IV eyepieces can be set most easily to the same magnification, even in the dark. The click-sound has been smoothened, so that hunters or birders will not disturb their targets when zooming in on them.
Hyperion Mark IV Universal Zoom 8-24mm Eyepiece
with 1¼" / 2" nosepieces and ClickStop-Action
Zoom-lenses in general are not really famous for high quality optics. Also many zoom-eyepieces do not deliver the best possible image quality at high magnification because they were designed with focus on the price-tag so that image sharpness and field size is getting worse with increased magnification.
The recognition that the Hyperion Zoom Eyepiece enjoys is based on the fact that it was designed the other way around: the glass selection and most of all the principal optical design and consequently the lens polish quality – all were optimized for the highest magnification. And obviously, when closing in on an object you will want the field of view to increase and not to have it become seemingly smaller. Hence the Hyperion-Zoom shows the largest apparent field of view at highest magnification.
For many birders, observers of nature and astronomers alike, the Hyperion Zoom Eyepiece is their favorite eyepiece, it is also the only zoom-eyepiece that was designed from ground up to be used with bino-viewers.
What's new in the model "Universal Zoom Mark IV"?
Even Bestsellers can be improved: The fourth generation of this eyepiece weighs 290 gram and is lighter by 80 grams than its predecessor - it now has 55 mm diameter to become useful in dual mode from 55 mm interpupillary distance, both features make it especially desirable for use with bino-viewers. The adjustable eyecup can be removed to expose the M43 video/photo thread and create the maximum "nose space" for using it on binocular viewers with the supplied winged rubber eyecups - for maximum concentration on the target. The click-stop action has been smoothed out to more easily access the magnification stops at 8/12/16/20 and 24mm (click-stops are mandatory to easily and precisely set both eyepieces to the same focal length for effortless binocular observation without eye-strain). The zooming-mechanism as well as the inner zooming rails for all lens groups have been modified to improve cold temperature operation and the parfocalty for each focal length has been finetuned.
Most important however – the Mark IV offers almost 4 mm more backfocus. This is most beneficial for application with a multitude of spotting scopes. Two different Adapters for telescope and spotting scope adaptation are included with the eyepiece (Spotting-Scope Adapter „A“ and Telescope-Adapter „B“). Read more at "Telescope-sided Connections").
The Mark IV comes with both the 2" and 1¼" nosepieces mounted, each nosepiece having it´s own dust cap and both nosepieces are threaded to accept either 1¼" or 2" eyepiece filters. Both nosepieces are free of the hated undercuts. Instead our proprietary Zero-Tilt Safety-Kerfs provide an added measure of security by reducing the tendency of an eyepiece to slip from an unlocked eyepiece clamp. An additional little feature is the Baader-yellow soft pouch with integrated belt strap – which fastens onto many tripod legs just as well, to serve as a bin for all dustcaps that may go astray otherwise.
As usual with Baader eyepieces, the Mark IV offers an M43 photo/video thread on top of the eyepiece, to allow attachment of any desired DSLR or T-2 accessory for mounting a video-camera by means of the optional M43/T-2 adapter ring #2958080. Unchanged is the optical quality, 68° field of view at highest magnification, Phantom Group multicoatings, a large adjustable eyecup or alternatively two M43 rubber eyecups for bino viewing. An optional spacer ring M43/M43 (#2954250) with 7,5 mm extension enables the user to increase the height of these eyecups in case of need.
The Mark IV likewise accepts adaptation of the 2.25x Hyperion-Barlow onto the 1¼" nosepiece, to transform into a high power zoom, featuring the magnification range of 3.6 to 10.7 mm. The Hyperion Universal Zoom Mark IV is available individually (#2454826) or as set together with the 2.25x Hyperion Barlow (#2454827)
Please also note our detailed Hyperion Universal Zoom Mark IV Instruction manual (also under the tab "Downloads") for further information.
Connection Options and Included Items
The Hyperion zoom Mark III comes with two removable barrels (1¼ "and 2"), as well as an 2" SC-thread for direct connection on telescopes or mirrors/prisms with the optional 2"/2" changer ring (#1508080).
Furthermore included in the scope of supply are two adapters of different height - both with 1 3/8" inner threads - for following uses:
- Spotting Scope-Adapter A: 4mm gain on backfocus. the Mark IV focuses with all tested spotting scopes (optional adapters available for most major brands)
Many spotting scopes nowadays do allow the mechanical insertion of astronomical 1¼" eyepieces – but in many cases this combo cannot focus to infinity. By utilizing the supplied spotting-scope adapter ring "A", the Hyperion Universal Zoom reaches almost four mm deeper into the eyepiece clamp of all those spotters, to safely reach infinity focus. When removing the 1¼" nosepiece, a 1 3/8" thread inside the "A"-ring will make the Mark IV firmly thread onto all Celestron-Ultima spotters and it´s namesakes. Optional available is a bayonet-adapter for Zeiss Diascope-spotters (#2454500). Threaded adapters for many other famous spotting scope brands (that still don´t allow 1¼" eyepiece adaptation) will become available in the future – now that it makes sense to produce them
- Telescope-Adapter B: Sufficient distance to clamping screws..
When using the Mark IV on a telescope though, the "B"-ring (supplied) should be chosen instead, to keep the bottom of the eyepiece flush with the upper end of most star diagonals. Otherwise the bottom 2" SC-threaded holding ring that holds the "A" or "B" ring in place may directly rest on the clamping screws of the star diagonal. The supplied 2" SC-ring also allows the Mark IV to firmly mount the eyepiece onto any SC-thread, especially onto our 2" clicklock star diagonal, with the help of the 2"/2" adapter (#1508020).
Please see the instruction manual for more information on changing both Adapters.
As usual with Baader eyepieces, the Mark IV offers an M43 photo/video thread on top of the eyepiece to directly attach most video cameras. It also allows attachment of any desired DSLR or T-2 accessory by means of the optional Baader Hyperion T-Adapter M43i / T-2a #2958080. An optional spacer ring M43/M43 (#2954250) with 7,5 mm extension enables the user to increase the height of the included eyecups in case of need or to attach M43 cameras without touching the lenses.
A further connection capability offers the SP54-system thread-in the form of the Hyperion DT ring system. For this system, the transition ring M43/SP54 #2958086 is suitable for the Mark IV zoom eyepiece. This adapter enables the connection of all common camera lenses on the Hyperion zoom to use it for Eyepiece Projection. Those connection rings are called "Hyperion DT rings", see our section "Eyepiece accessories" .
Read more on camera connections, required distances and adapters in our detailed instruction manual
Three different eye cups are included in the basic equipment of the eyepiece.
- Initially mounted is the large height-adjustable eyecup that also fastens onto the M43 photo-thread of the eyepiece. By rotating it counterclockwise the height will increase. This eyecup easily unthreads simply by rotating it upward further than the uppermost stop - this reveals the M43-thread connection
- A none-folding rubber eyecup alternatively fits straight onto the M43-thread. This is the preferred solution for observers without glasses at a binoviewer. It gives you enough room for your nose and good support to keep the perfect eye distance.
- An even lower eyecup with foldable winged eye shield especially serves for wearers of eye glasses, the flappable side shields block stray light and side image information not part of the eyepiece field of view. This helps to concentrate on the target when using a binoviewer.
Comparison: Original Zeiss photo adapter and Baader Hyperion Universal Zoom Mark IV eyepiece as photographic projection
- Zeiss Diascope photo adapter produces one fixed magnification
- Zeiss Diascope with Baader Hyperion Mark IV Universal Zoom eyepiece and T-2 quick change system (T2# 6/7) gives five magnification with increasing field of view
- Spotting Scope-Adapter A: 4mm gain on backfocus. the Mark IV focuses with all tested spotting scopes (optional adapters available for most major brands)
|Focal Length||8 - 24 mm|
|Apparent Field of View||48° - 68°|
|AR-Coating||Phantom Coating® Group|
|Barrel Size (in)||1¼", 2"|
|Speciality||Eyepiece projection: afocal, Eyepiece projection: classical|
|Number of Lens Elements||7|
|Number of Groups||4|
|Slip Protect Safety||Safety Kerfs|
|Eyepiece Body above Reference Plane (mm)||81 mm|
|Length of 1¼" barrel (mm)||24,5 mm|
|Length of 2" barrel (mm)||27 mm|
|Outer Diameter||55 mm|
|Outer Connection (eyepiece/-camera-sided)||Thread, M43|
|Inner Connection (lens sided)||Thread, 1 3/8", 2" (50,8mm)|
|Outer Connection (lens sided)||Barrel, 1¼", 2" (50,8mm)|
|Threaded for filters||Yes|
|Dustcaps||1¼" dustcap (31,8mm), 2" dustcap (45mm), 2" dustcap (46.5mm - fits over eyecup)|
|Eyecups||large height adjustable eyecup (M43), small eyecup (M43), winged eyecup (M43)|