This 31mm, unmounted Baader 3.5/4nm H-Alpha CMOS Filter 31mm Unmountedfrom Baader 3.5/4nm H-Alpha CMOS Filter 31mm Unmountedis recommended for extremely fast optical systems from f/3.4 to 2.3 and is particularly designed for the special filter requirements of f/3 optics. The filter features a Reflex-Blocker hard coating, which has been optically 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

Related Questions and Answers

Q: 1. Does this holder accept the True Color CPL?

A: Yes the NiSi V7 Alpha 100mm Aluminum Filter Holder can hold this NiSi True Color CPL Filter: https://bhpho.to/3KMNA9Q

Q: 2. 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: 3. Is the 82mm mounting ring compatible with the NiSi V5 circular polarizing filter?

A: No, the 82mm adapter ring is for a lens not the V5 polarizing filter.

Q: 4. Is this a new lens? It says 'new item' in the description. Whats the difference between this lens and previous FA 31mm f/1.8 lenses

A: This is new release from Pentax: it is optically the same as the previous 31mm lens, but with a newly applied HD coating to produce clear, crisp images even under demanding conditions, and a completely round-shaped diaphragm, as well as an SP coating to the front optical element to improve the water/grease-repellent and scratch-resistant performance.

Q: 5. Is the 82mm mounting ring compatible with general 72-82mm Step-Up Ring?

A: Yes, you can use the V7's mounting ring onto step-up rings without issue.

Q: 6. I want to buy one, is the one you are selling new package ? i.e. ricoh package, not the old pentax package

A: This is a new, unopened item. Actual packaging may vary pending how long it has been on the shelf.

Q: 7. Can I insert a 4x4 filter, a 4x6 filter, and a NiSi True Color CPL Filter all into this holder?

A: You can insert 4x4 filters, 4x6 filters, and the NiSi True Color CPL Filter in the NiSi V7 Alpha 100mm Aluminum Filter Holder.

Q: 8. When used on a film camera, does the focusing ring work manually?

A: Manual focus is possible with this lens using the focusing ring.

Q: 9. will this lens mount and work perfectly with a pentax k1000?

A: K1000 has no autofocus motor to run the screw drive. FA-31 ltd otherwise acts like an A lens with an automatic aperture setting but you'll be manual focusing it.

Q: 10. This 31mm or the 35mm 1.4? Preference?

A: Selecting what is best depends on the job to be done. These lenses are not in the same class, the choice will be made on how high a quality of image and working experience is required. If the photographs are for personal use as well as experimentation in gathering different looks for an art piece, the Samyang 35mm f/1.4 AS UMC is as good as anything. If the photograph is for commercial paid work, then no question you want the rugged reliability and top level image quality of the Pentax smcP FA 31mm f/1.8. Clients will not be impressed with how much you saved buying the lower price lens if the image is not perfect or if the lens fails mechanically during the shoot.