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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"?
Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)
What are the threads and pitch of your 1.25" and 2" filters?
Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)
Rating of Question
52
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
I'am using de 2" Ultra High Speed filters Ha, SII en OIII for my C14 Hyperstar. Can you tell me which side of the filter should point to the camera? Or does this not matter.
Question by: Edwin van der Sijde on Sep 18, 2021 11:03:00 AM | 1 Answer(s)
Rating of Question
8
In mounted form the male thread must point towards the camera. The filter is already mounted in the cell in the correct way to achieve this.
Answer by: Baader Web Team (Admin) on Sep 21, 2021 9:23:00 AM
Are there downsides when using the 'ultra fast' filters with 'slower' sytems. For example if I were to use the ultra fast filters on an f7 system would there be any negative effects? (I have both fast and slow systems and was planning on buying the ultra fast set but only if I can also use them with the slower setups)
Question by: Michael on Jul 8, 2021 12:20:00 PM | 1 Answer(s)
Rating of Question
1
When using Highspeed filters with slower telescopes you will experience that the contrast degrades to the edge of the field. The longer the focal lenght the more dramatic is the effect. f/7 telescopes and Highspeed filters are absolutely non compatible, you will have a satisfying contrast only in the center of the image. For f/7 you need to buy the normal narrowband filters.
Answer by: Baader Web Team (Admin) on Jul 8, 2021 12:40:00 PM
Your F2 summary page based on the whitepaper results state if you're imaging in a light polluted Bortle 6 sky and above the 3.5/4nm filters are recommended rather than the 6.5nm ones. If I were to purchase the narrower ones what affect will it have if shooting from a lower than Bortle 6 sky? Also what difference will there be compared to the 6.5nm versions in the same situations?
Question by: D on Jul 13, 2022 2:07:00 PM | 1 Answer(s)
Rating of Question
1
The effect of Ultra-Narrowband 3.5/4nm filters is that stars will always be smaller than the standard narrowband filters by factor 1.4 - regardless of sky quality.
Answer by: Baader Web Team (Admin) on Jul 13, 2022 4:23:00 PM
What happen when i use this ultrfast narrowband filters recommended for F3,4-1,8 on a F4?
Question by: Jan on Dec 21, 2021 2:09:00 AM | 2 Answer(s)
Rating of Question
1
and would that be a big difference? When its F1,8-3,4 used on F4? Asking cause if i wish to place a reducer on the scope, and buy the classic version F4+ filters it would be much bigger difference?
Answer by: Jan Müller on Dec 21, 2021 2:02:27 PM
Rate Answer
15
If you use the filter outside the specifications, the following happens: The "slower" the telescope, the worse the contrast becomes, especially at the edge of the image field in the selected wavelength.
Answer by: Baader Web Team (Admin) on Dec 21, 2021 9:40:00 AM
Hi, besides a telescope i am also using the following setup: Canon EOS Ra + Canon L series high speed lenses (from wide angle to 400mm). I own multiple 2" M48 (threaded) NB filters and want to expand this (2" mountable only).
Question: Do you offer / know a good solution to use my Baader 2" filter set in combination with the Ra+Canon lenses please?
Question by: Bert De Wilde on Nov 23, 2021 7:54:00 AM | 1 Answer(s)
Rating of Question
0
Here you find our adaptor solution for adding 2" filters in front of all kinds of lenses with the help of the filter thread https://www.baader-planetarium.com/en/filters/filter-accessories/baader-dslr-2%22-filter-holder-m48sp54.html
Unfortunately your Highspeed filters are not suitable for mounting in front of fast lenses - they need to be installed BEHIND the lens, like they get installed behind telescopes. If you want to place narrowband filters in front of a lens you need to choose the "normal" ones and not the Highspeed version.
Answer by: Baader Web Team (Admin) on Nov 25, 2021 8:31:00 AM
What is the actual disadvantage of using these filters with a Kodak KAF 12600 CCD mono chip. What is the resistance of these filters, especially the OIII, to bright star hallows caused by fast optics.
Question by: Lynn on Aug 28, 2021 11:25:00 PM | 1 Answer(s)
Rating of Question
-3
There is no disadvantage when using the filters with CCD cameras instead of CMOS cameras. These all new CMOS-optimized filters work magnificently with all existing digital camera technologies, be it CMOS or CCD. Our testers and customers have proven that halos created by fast optics get reduced significantly or even disappear completely. Please see here https://www.baader-planetarium.com/en/blog/new-baader-cmos-optimized-ultra-narrowband-and-highspeed-filters/
Answer by: Baader Web Team (Admin) on Aug 31, 2021 8:27:00 AM
I have the Celestron EdgeHD 11 and HyperStar v4. I already have a set of Baader 6.5nm Narrowband 2" CMOS Optimized filters, but they are not optimized for the f/1.8 I will get with HyperStar. What will really be the difference I see with the Ultra Highspeed filters compared with what I have?
Question by: Martin Cohen on Oct 25, 2021 5:11:00 PM | 1 Answer(s)
Rating of Question
-15
With 6.5 nm FWHM there is a slight chance that you will get sufficient signal when moving from f/7 (Edge HD w. reducer/corrector) to f/2 or f/1.9. However – this needs to be tested as it is not within our usual offer, which separates clearly between filters made for f/10 to f/3.5
For Ulra-Narrowband filters with 3.5 or 4 nm FWHM there is no chance to cover such a wide range of FLs. there you would always have to buy two different filter sets to cover both sets of FL-ratios.
Answer by: Baader Web Team (Admin) on Oct 26, 2021 8:05:00 AM
This new generation of Baader CMOS-filters features:
CMOS-optimized Baader Filters
Increased contrast
Ever more narrow passbands
Reflex-Blocker™ coatings, for largest ever freedom from halos, even under most adverse conditions concerning aux-optics
FWHM on each filter category carefully designed to allow for 1:1:1 exposures, matched for typical CMOS quantum efficiency and s/n ratio
Identical filter thickness to existing standards, with utmost care for parfocality
Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim, to additionally eliminate any reflection due to light falling onto the edge of a filter
Each filter coated individually, with sealed coating edge (NOT cut out of a larger plate with coatings left exposed, read more)
Life-Coat™: evermore hard coatings to enable a non-aging coating for life – even in a most adverse environment
Further information, test reviews, image results...
Don´t be misled.
These all new CMOS-optimized filters work magnificently with all existing digital camera technologies, be it CMOS or CCD. However – an owner of CCD-camera-technology will still find our previous, extremely affordable, narrowband filter technology to be fully apt for excellent imaging. But: "the Better always is enemy to the Good".
We have received the following question on our Narrowband (and f/2 Highspeed) filters:
I understand that narrow-band filters suffer shifts of the passband for light rays that come in at...
APF-R goes online as official plugin in Adobe Photoshop
Christoph Kaltseis is a Photoshop expert and an experienced astrophotographer. In recent years, he has developed APF-R (Absolute Point of Focus),...
See results
Here you can jump directly to customer images taken with CMOS-optimized Baader Filters
Update May 4th, 2022:
After many customer feedback about our CMOS-Optimized Narrowband filters, we learned...
A brief introduction to the function of narrowband filters.
Narrowband filters have revolutionized CCD photography and now more and more image acquisition with CMOS cameras for the “amateur astronomer” in...
In contrast to H-Beta (see the blog post on the 5.5nm H-Beta filter), there have long been options on the market for OIII filters that go beyond the filters marketed...
The moment you insert any type of filter into the optical setup, which consists of your specific camera, the appropriate flattener/reducer or coma corrector and the telescope, the filter becomes...
About Baader Filters
The variety of uses for filters in amateur astronomy has considerably increased during the last decade, enabled by both more accurately manufactured optical accessories, and, above all, by the “digital revolution“....
In the summer of 2021 I approached Baader Planetarium to ask whether I could test the new Baader O-III Narrowband-Filters (6.5nm) – CMOS-optimized
(various versions available)
to explore its visual...
During the last couple of months after introducing our new CMOS-optimized filter families, we have received lots of positive feedback from our customers.
However, there was an increasing number of...
A field report after photographic acquisition of five different celestial objects.
From Dr. Claus Possberg, Freyung Observatory (www.possi.space) – October 2022
The use of ultra-highspeed systems such as Celestron RASA,...
What do you look for in an astronomical filter? Everyone has different requirements and goals and with a myriad of filters available today; how do you choose the right filters...
What do you look for in an astronomical filter? Everyone has different requirements and goals and with a myriad of filters available today; how do you choose the right filters to unleash the full potential of Astrophotography?
In this blog our customer Ian Aiken gives some high level advice on what to look for when choosing a filter, coupled with reasoning why he choose the Baader's CMOS-Optimized LRGBand Ultra Narrowband f/2 filters, along with example LRGB and SHO images taken with these filters on his Celestron RASA 11 from his Bortle 7 suburban location.
Blog Post by Ian Aiken:
I live in the North East of England in the United Kingdom, which experiences a temperate maritime climate characterized by mild summers and cool winters. Cloudiness can vary throughout the year and it feels like I only get 20 usable clear nights per year at my Bortle 7 location during the 6 months where astronomical darkness actually occurs. I've been an Astrophotographer for over 20 years and I've had all kinds of telescopes, mounts, filters (including Optolong, Astro Hutech, Chroma, Baader) and cameras (Atik, QHYCCD, ZWO, Canon) in this time, for both planetary and deep sky photography. Financially, I've learnt the hard way through fine tuning my current collection to something which supports my sky conditions, budget, time, and imaging goals.
Currently I own a Skywatcher EQ8 mounted in my roll off roof observatory. On this I have a RASA 11 with Baader UFC, QHY268M camera and Baader's CMOS-Optimized LRGB and Ultra-Narrowband f/2 filters.
Here are the factors I've considered when choosing my filters:
Price: Assess the price of the product in relation to its features, quality, and performance. Is the price reasonable and competitive compared to similar products in the market? Consider whether the product offers significant advantages or unique features that justify its price.
In my opinion, Baader filters are absolutely value for money. They've kept the price competitive and performance high. A set of Baader filters costs a little more than a single Chroma. Chroma are good, but did not feel value for money in comparison (Baader 2" LRGB set ~ € 500 vs. Chroma LRGB ~ € 2.238).
Quality: Examine the quality of the product. Does it meet your expectations in terms of durability, craftsmanship, and overall build quality? A product that is well-made and built to last will provide better long-term value.
Baader CMOS-Optimized filters come with Baader Planetarium's Life-Coat technology. Baader warrant the coatings for the life of the filter guaranteeing that the coatings will not peel, flake or physically degrade and they have no issues with you cleaning the filters with fine optical cleaning equipment. You can see the build quality is high, the coatings look durable, and I can understand how Baader can offer such a life time warranty. I don't think anyone else offers this.
Performance: Evaluate how well the product performs its intended function. Does it deliver the expected results or fulfil your requirements? Consider its efficiency, accuracy, reliability, and any additional benefits it provides compared to alternative options.
I'm going to post some images later in this blog, and you can judge the quality for yourself. Yes, there were initial problems with halos and these have been resolved. I haven't had any issues that I am concerned about. Halos can be a real pain, and it's not always the filter that causes this (most cases it is not the filter). Reflections can occur in your imaging system and could be caused by a number of factors: including spacing between optical elements; distance to CMOS camera; the CMOS camera front window itself etc. You have to spend time to understand your entire optical system and its individual nuances.
Features and Specifications: Review the features, specifications, and capabilities of the product. Are there any unique or advanced features that differentiate it from competing products? Determine whether these features are essential to your needs and whether they justify the price.
I opted for high-speed ultra-narrowband to match with my RASA 11. This was based upon my needs (explained a bit further below). In terms of features, what stood out was the features integrated into the filters to help prevent reflections and halos. For instance:
Reflex-Blocker - with coatings to reduce halos caused by my imaging system.
Parfocal - this helps to not have to refocus so much during a filter change. As a filter change is manual on my RASA 11 with the Baader UFC system, it means less movement with my motorised focuser and I am back to imaging quicker (and the focuser isn't off on some mission to reach focus by going further out of focus, which can happen when using an SCT type design).
Blackened edges - again to help reduce reflections in my imaging system, lots of mirrors and glass = high potential for reflection
Sealed Coating Edge - each filter is coated individually and not cut from a sheet. This is probably why they will last forever, and Baader are able to offer Life-Coat warranty.
Brand Reputation and Customer Reviews: Research the brand's reputation and customer reviews of the product. Look for feedback from other customers who have used the product to gain insights into its performance, reliability, and customer satisfaction. Positive reviews and a strong brand reputation can indicate better value for money.
Baader Planetarium have been in business since 1966. I've never experienced any poor customer care from dealers or Baader directly (I admit, I've not really had any issues either, with exception of one issues with the early Baader Steeltrack software which was swiftly resolved by Baader themselves). As a family run business, I feel they are passionate with what they do, and want to do the right thing at the right price, making astronomy accessible to all budget types, and truly are Aiders in Astronomy (this is their slogan).
Longevity and Future Compatibility: Consider the product's longevity and future compatibility. Will it remain relevant and usable for a reasonable period? Assess whether the product is upgradable or compatible with future advancements or technologies to ensure its value over time.
I have the older Baader 2" CCD filters which are in the same condition that I purchased them in. I have no concerns about the longevity of the Baader CMOS Optimised filters, especially backed by the Life-Coat warranty. 2" filters are going nowhere, and while the sensors on modern CMOS cameras are getting larger, I cannot see the need to upgrade anytime soon. I've been using 2" filters for the past 20 years.
Warranty and Customer Support: Evaluate the warranty offered by the manufacturer and the availability of customer support. A reliable warranty and responsive customer support can provide additional value by offering peace of mind and assistance in case of any issues or defects.
Baader offers Life-Coat, a lifetime warranty on their CMOS-Optimized filters (providing used and handled correctly). As a family run business operating for over 50 years, Baader are trustworthy and offer great customer support.
Personal Needs and Preferences: Finally, consider how well the product aligns with your specific needs, preferences, and intended use. Different products may cater to different requirements, so it's essential to choose one that best suits your circumstances and priorities.
What did I choose?
I decided on the Ultra Narrowband High-Speed filters on my RASA 11. Why? Well, the reasoning may surprise you. While the filters are excellent value for money, my garden backs onto other gardens and my neighbours have lots of LED lights lit, especially on weekends when it's not windy, the moon is not out, and the sky conditions are good. You can picture the challenges already. Also, there are trees which do not belong to me which get in the way. I work full time, and have two small children, time is limited. I'm middle-aged, but not retired, so I cannot stay up all night imaging into the early hours. So, I went for a RASA for high speed imaging, reducing my imaging time significantly. While I may image across multiple nights, I don't need to. It just works for my current situation. The Baader filters are brilliant on the RASA 11, and I'm able to produce some excellent results (see further in the blog) even with all my challenges.
I hope the above helps you make a decision on what filters would be good for your needs. Baader Planetarium has a really nice tool to help you match which filters would be best for your imaging system. At time of writing you can access this tool: Baader Narrowband-/Highspeed Filter Selector
Example of Astrophotography taken with Baader CMOS Optimized Filters
I could talk about how tight the stars are (they are), how the filters have much more contrast than their predecessors (they do), but this can still be very subjective and influenced by sky conditions. My skies aren't great, they really aren't, and I have to battle with all the other issues living in a suburban environment. These images were also shot in reasonably poor conditions with thin haze. I also have to point out that I don't spend a massive amount of time processing my images. I think partly, if you capture good data you can produce a good image. You don't, in my opinion, need to push an imagine in processing so that it looks so bright and colourful. To me this looks over processed, and I prefer the darker looking style images with simple histogram and curves transformations. There's the disclaimers out of the way.
My workflow consists of using PixInsight to Calibrate, Stack, Automatic Background Neutralisation, BlurXterminate, NoiseXterminate, and maybe StarXterminate. I may use TGV Denoise post stretching but haven't on these examples. I simply use the ScreenTransferFunction (STF) in PI applied to the Histogram, and a hint of Curves Transformation before exporting off into a PNG/JPG. There's probably so much more I could do, but I don't. Oh, I nearly forgot. I do use PhotometricColorCalobration in PixInsight, which applies a white balance to the image.
NGC 7023 - The Iris Nebula 2 hour integration from Bortle 7 sky
NGC 7023, also known as the Iris Nebula, is a captivating and visually striking celestial object located in the constellation Cepheus. This reflection nebula lies approximately 1,300 light-years away from Earth, and its unique features have made it a favourite target for amateur and professional astronomers alike. The Iris Nebula gets its name from the distinct shape and appearance of its central region, which resembles an iris or an eye. This prominent feature is created by a dense cloud of interstellar dust, which scatters and reflects the light emitted by nearby stars. The dust particles in the nebula also create intricate dark filaments, adding to its overall visual allure. At the heart of NGC 7023 lies a young star cluster, illuminating the surrounding gas and dust with its intense radiation. This interaction gives rise to the vibrant hues of blue and yellow seen in many astro photographs of the nebula.
Imaging System: QHY286M CMOS Camera mounted on RASA 11 with Baader UFC. Filters: Baader CMOS Optimised LRGB Mount: Skywatcher EQ8 Exposure Details: 30 x 60 seconds each channel (LRGB). Total 2 hours integration time from Bortle 7 skies.
NGC 7635 - The Bubble Nebula 17 Hour Integration from Bortle 7 Sky
NGC 7635, famously known as the Bubble Nebula, is a captivating and visually stunning emission nebula located in the constellation Cassiopeia. Its unique structure and distinct appearance have made it a popular target for both amateur and professional astronomers. The Bubble Nebula derives its name from the spherical bubble-like structure at its center, which is created by the powerful stellar wind and radiation emitted by a massive, hot, and young central star. This star, known as BD+60 2522, is estimated to be several times more massive than our Sun and emits intense ultraviolet radiation, which ionizes the surrounding hydrogen gas. The ionized gas then emits light, creating the striking reddish glow seen in images of the nebula.
Imaging System: QHY286M CMOS Camera mounted on RASA 11 with Baader UFC. Filters: Baader CMOS Optimised 3.5/4nm f/2 Ultra Highspeed (Ultra-Narrowband) filters. Mount: Skywatcher EQ8 Exposure Details: Ha: 354x60s, SII: 121x60s & 104x120s, OIII: 175x120s. Total ~17 hours integration time from Bortle 7 skies.
Don't ask why the varying exposure! I'd also like to collect more data on SII and OIII in due course given it's about half of what I planned and need. You can tell by the images more is needed. Maybe next time, right? Astrophotography is for life not just for Christmas, or something like that…
I mixed the combination using PixelMath in PixInsight.
NGC 7635 - Baader f/2 3.5nm Ha CMOS-OptimizedNGC 7635 - Baader f/2 4nm OIII CMOS-OptimizedNGC 7635 - Baader f/2 4nm SII CMOS-OptimizedNGC 7635 - RGB/SHO Combination with StarsNGC 7635 - RGB/SHO Combination with Reduced StarsNGC 7635 - RGB/SHO Combination without StarsNGC 7635 - RGB/SHO Combination Crop
And finally to finish off, M45 taken with Baader CMOS-Optimized LRGB on same kits as above.
Equipment für den Filtervergleich und Beispielbilder:
Celestron RASA 11” f/2.2, ZWO ASI 1600MM Pro (Alle Fotos außer NGC 2244 – Rosettennebel) / QHY268M, Baader f/2 Ultra-Highspeed Filterset 50x50 mm, Baader RGB Filterset CMOS, Baader UFC + UFC Tilter.
Ein direkter Vergleich:
F/2 Highspeed Filter: Mich hat die frühere Reihe der f/2 Highspeed Filter seit etwa 2.5 Jahren begleitet und ich habe damit tolle Ergebnisse, sowie auch einige Auszeichnungen erzielen können. Gerade der H-alpha und S-II Filter haben auch bei meinem eher schlechten Bortle 6/7 Himmel einen guten Kontrast erzielt, der O-III Filter hatte da schon mehr mit meinem hellen Himmel und dem Mond zu kämpfen. Ich habe den deutlichen helleren Hintergrund immer durch kürzere Belichtungszeiten bzw. niedrigeren Gain ausgeglichen. Das allbekannte Halo-Problem um helle Sterne habe ich meistens nur beim O-III Filter (manchmal aber auch beim S-II Filter) feststellen können. Durch vorsichtige Bildbearbeitung konnte ich die Halos aber meistens restlos „retuschieren“.
F/2 Ultra-Highspeed Filter (3.5 / 4 nm): Die neuen Ultra-Highspeed Filter zeigen dagegen „out of the Box“ einen deutlich höheren Kontrast, Sterne werden wesentlich besser unterdrückt und Nebelstruckturen sind deutlich hervorgehoben (Vergleichsbilder WR 134). Ich habe bisher keinerlei Reflexionen oder Halos feststellen können und das bei f/2.2! Das neue Filterset harmonisiert zudem wesentlich besser bei gleichen Belichtungszeiten von H-alpha/S-II mit O-III. Ich belichte mittlerweile in allen drei Schmalbandkanäle mit dem gleichen Gain/Belichtungszeit und erreiche bei allen Filtern einen ähnlichen Mittelwert.
Fazit:
Eine deutliche Kontraststeigerung in allen Schmalbandkanälen! Der O-III Filter zeigt definitiv den gravierendsten Unterschied – keinerlei Reflexionen und nur minimale Halos bei super hellen Sternen wie Alnitak. Der H-alpha und S-II Filter sind absolut tadellos! Hervorragend optimiert für die neuen CMOS Sensoren (IMX 571 / IMX 455), aber auch an den älteren CMOS Sensoren wie dem Panasonic MN34230 Chip (ASI 1600MMP) problemlos einsetzbar.
High Class Filter mit einem super Preis-Leistungs-Verhältnis – Meiner Meinung nach die besten Schmalbandfilter für Hyperstar bzw. RASA Optiken!
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Christoph Kaltseis
102/04/2022
13/04/202209:51
Rating:
M42 als Intensives SHO Bild mit den Ultra Narrowband f2 Highspeed Filter
In der Erstellung an den RGB Eindruck gehalten, der die Verteilung etwas beschreibt;
Mit dem dem RASA 8 f2.0 + dem FCCT + QHY268M und den Baader Ultra Narrowband f2 highspeed filters für H-Alpha (3,5nm), OIII(4nm) & SII(4nm).
Keine Spur eines Reflexes oder Halo! und sehr wenig die Belichtungszeit = 64min für alle SHO Daten!
Montierung + Autogiuding: Celestron CGX + StarAID-B + QHY Mini GuiderScope
HDR Version mit einer Belichtungszeit!
CS Christoph
Alles und besonders die Größe und Stabilität des Systems!
nix
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Julian Shroff
323/11/2021
20/11/202111:22
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New filters for a new era of narrowband imaging
For a long time, imaging at F2 was sort of an RGB-only thing for me. But when I came upon the new Baader High Speed Ultra Narrowband F2 Filters, that changed. With the new ability to shoot narrowband targets at 3.5/4/4nm for Ha/Oiii/Sii respectively, this truly changed the way I view narrowband imaging.
After thoroughly testing the new filters, I'm happy to say that they work just they way they are supposed to: They produce deep and clean images of narrowband targets with high-resolution CMOS cameras, while avoiding the common issues of F2 imaging such as reflections or halos.
I have three sample images which were between 4 and 8 hours of integration time each with my RASA 8" and QHY183M Monochrome camera.
Everything, really. Affordable filters that produce very clean images. What more could we want? :)
With these new Ultra-Highspeed filters Baader Planetarium indeed found their way. I use the Ha (3.5nm), OIII (4nm) and SII (4nm) in combination with a Takahashi Epsilon-180ED f/2.8 and ZWO ASI294MM Pro in severe light pollution (Bortle 8/9) from my garden observatory in The Netherlands. Here's an example of an SHO colour mapped image over approximataly 29 hours of integration time captured with this setup. Thanks to the new coating-technology of these CMOS-optimized filters, halos have become history.
Great value for money, excellent suitable for CMOS sensor thanks to new coating-technology