Baader 6.5Nm S-Ii Highspeed Cmos Filter 31Mm Unmounted

Baader 6.5nm S-ii Highspeed Cmos Filter 31mm Unmounted

Product Code: eq92164
Availability: In Stock

$561.00 $740.52

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Description
Reviews (13)

This 31mm round, unmounted round Baader 6.5nm S-II Highspeed CMOS Filter 31mm Unmountedfrom Baader 6.5nm S-II Highspeed CMOS Filter 31mm Unmountedis recommended for extremely fast optical systems from f/3.4 to 1.8, and is designed for the special filter requirements of fast optics like Celestron RASA astrographs. The filter features a Reflex-Blocker hard coating, which has been planoptically polished, and has Life-Coat sealed edges. It is equally suitable for modern CMOS sensors as well as for older CCD camera technologies.

Optimized for CMOS, Suitable for CCD Reflex-Blocker Hard Coated Life-Coat Sealed Coating Edges

Parameters
Size	31mm Round, Unmounted

6.5nm FWHM, recommended for extremely fast optical systems from f/3.4 to 1.8
Specially designed for the special filter requirements when used with fast optics like the Celestron RASA astrographs
Reflex-Blocker hard coated and planoptically polished with sealed coating edges (Life-Coat)
Blackened edges all around, with filter-lead-side indicator in the form of a black frontside outer rim
Optimized for modern CMOS cameras, but excellent for CCD camera technologies

Related Questions and Answers

Q: 1. it works on pentax K-1...is this a full frame lens?

A: Yes, this is a full frame Pentax lens and will be compatible with the Pentax K1.

Q: 2. Does it retain IS function?

A: I do not know. It appears to, but I use the extension tubes on the tripod most of the time due to the shallow depth of field.

Q: 3. Does the new HD FA31mm F1.8 use a SDM motor?

A: The HD Pentax-FA 31mm f/1.8 Limited uses Body AF drive--the camera body supplies the autofocus motor. It does not use an SDM motor.

Q: 4. Will this lens work on the new Pentax K1?

A: Absolutely. It's a fantastic lens. Extremely sharp.

Q: 5. I'm new to astronomy. I have Orion ED triplet 130mm refactor. So I want to make sure this binoviewer fits and what are all the accessories needed before placing order?

A: It comes with all you need to mount it to the scope It dose not come with any eyepieces

Q: 6. What storage container would you recommend for a pair of these filters? Thanks

A: It would be best to use the box the filter comes in or use this Print File box: https://bhpho.to/3uHvHCQ

Q: 7. Can you please list out the items come with this package $657.00 : 2.6X glasspath compensator and 2 inch nosepiece?

A: In the Box Alpine Astronomical Baader MaxBright II Binoviewer (1.25") Carrying Case Zeiss Micro-Bayonet Mounting Adapter Limited 2-Year Warranty Alpine Astronomical Glasspath Corrector 2.6x for Maxbright/Mark V Binoviewers BH #ALGLASS3 • MFR #GLASS-3 https://www.bhphotovideo.com/c/product/1405373-REG/alpine_astronomical_glass_3_glasspath_corrector_1_2_6_for.html Alpine Astronomical Baader 2" T-2 Nosepiece BH #ALT216 • MFR #T2-16 https://www.bhphotovideo.com/c/product/1406318-REG/alpine_astronomical_t2_16_baader_2_nosepiece.html

Q: 8. I recently purchased a B+W F-Pro Kaesemann circular MRC polarizer filter for the FA 31. I have read where some filters/brands, when screwed down on the FA 31, contact the front lens element...not good. Will it be safe for me to tighten this filter onto my FA 31? Thanks for any advice you can give.

A: You will be safe to use the 58mm B+W XS-Pro Kaesemann Circular MRC Polarizer on the FA 31.

Q: 9. I have a K-30. I want this lens for group photos. Is it a good choice? Will it auto focus? Or do I need to learn manual focus

A: The Pentax HD Pentax-FA 31mm f/1.8 Limited (Silver) is an auto focus lens and compatible with the K30 camera. But since the number of people in a group will vary as well as the available distance between you and the group, you might want to consider this 16-50mm f2.8 zoom instead: https://bhpho.to/3ihSTRz

Q: 10. Why are there two Herschel wedges, photo and visual?? why can't one wedge be used for both with some adjustments?

A: The Alpine Astronomical Baader Cool-Ceramic Safety Herschel Solar Photographic Prism Mark II includes all the items in the visual version with the addition of 1.8, 0.9, and 0.6 neutral density filters. Aside for the extra filters, the other components are exactly the same.

Terry	27/09/2024
Baader makes some great lenses and filters, I have yet to be disappointed and this one is no different. 5

Carlo	22/08/2024
They work quite well; no halos or any undesirable behavior which I could notice as of now. They did require an increase in exposure time, but that's expected. 5

William	13/08/2024
One of the best items I've purchased for my 140mm telescope. The reduction in sky glow and the contrast improvement add to those Oh, Wow! moments of star gazing. 5

Lovick	06/08/2024
The CMOS air filter provides clean air for the Nitecore BlowerBaby, which gives additional assurance while cleaning camera sensors and lenses. 5

John	23/07/2024
I live in heavily light polluted skies, yet I can go out in the backyard and look up at the billowing clouds of the milky way. I can actually see meteorite showers when they are happening. This is all possible by using this filter in conjunction with a Gen3 night vision device. This filter blocks out all light below 685nm which is basically all the man made light pollution leaving mostly celestial light for your enjoyment. This does cut out hydrogen alpha light, so you will not be seeing nebulae with this, but a separate band pass filter is used for that purpose. 5

Mike	29/06/2024
Finally got to use this for the first time last weekend on Jupiter. Provided nice, sharp images to combine with my Baader RGB filters 5

Harrison	23/06/2024
I bought this to see if it would help bring out some color and detail for my astrophotography. I have little light pollution in my area but it this thing really does what it's supposed to. I did some test shots with a colorchecker passport in regular daylight and the difference is definitely noticeable. There's a very clear boost in color and slight boost in contrast, what I mean is that they appear more clearly and saturated. It's magic! I might even start using this for some regular photography too! I have to use step-down adapters to fit these onto my lenses as I am not using it with a telescope (67mm, 58mm, 52mm). I just wish they made these in sizes native to DSLR/Mirrorless lenses! Highly recommend! Also if you are someone purchasing for a DSLR/Mirrorless camera, Get the 2 version of course, and you will need step-down/step-up adapters to 48mm. Even though 2 is not 48mm, that is the threads for this baader filter. I recommend the sensei filter adapters, cheap and very well made. In order to adapt some lens sizes down to 48mm, you might have to buy a couple adapters and stack them. I had to do this for my larger 67mm lenses. There will of course be vignetting when doing this, but its no big deal to me. 5

Adam	08/06/2024
Very nice. Could use one more thread though. Seems a little short on threading when trying to attach and remove while making lens changes in the dark. Makes me a little nervous sometimes that I will drop it during removal from the lens. Good quality though and I like having it around. 5

Javier	03/05/2024
Excellent filter 5

Elizabeth	27/04/2024
I have filters for both astrophotography and photometry. Getting a second carousel for my filter wheel was a good economic solution. It would be great if this came with a protective case. 5