This 2" eyepiece Baader 3.5nm H-Alpha CMOS Filter for Astrophotographyfrom Baader 3.5nm H-Alpha CMOS Filter for Astrophotographyis 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

• 4nm 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. does this model fits 100x150mm ND filter? thanks

A: Yes, NiSi V7 Alpha 100mm Aluminum Filter Holder is compatible with 100x150mm 2mm thick filters.

Q: 2. 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: 3. Will this fit the sony a7iv ?

A: The A7 IV is not currently on the compatibility list for the Kase Multicoated UV Clip-In Filter for Sony Alpha Cameras.

Q: 4. Can I add 2mm or 4mm filter guides to the filter holder like the LEE Filters holder?

A: The NiSi V7 Alpha 100mm Aluminum Filter Holder does not have optional guides to change the filter thickness.

Q: 5. I have the Celestron Eclipsmart 8" Solar Filter for my 8" SCT. Is it enough or I still need to buy an Energy Reduction filter?

A: In solar viewing, solar filters are for viewing the photosphere of the sun. The H-Alpha Eyepiece Solar Filter is for viewing the chromosphere of the sun.

Q: 6. how to adapt this to a camera lens with a 62mm thread (yes, this will result in some vignetting which I will have to tolerate)?

A: Currently B&H does not stock an adapter allowing the Alpine Astronomical H-Alpha 20nm Bandpass Filter (2") to a camera lens with a 62mm thread.

Q: 7. 1 Answers Will it be compatible with The a1?

A: No, Kase only lists for the Kase ND8 Clip-In Filter for Select Sony Alpha Cameras as compatible with, Sony A9 II, A9, A7R IV, A7R III, A7R II, A7R, A7S III, A7S II, A7S, A7 III, A7 II, A7 and they say whilst we are not currently aware of any lens restrictions, we can not guarantee all lenses will be compatible.

Q: 8. Does it cover astrophotography with just a dslr or is it exclusively for using a telescope?

A: The Thierry Legault Astrophotography discusses the use of cameras only and cameras with the use of telescopes.

Q: 9. 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: 10. Does it have an AntiReflective coating?

A: The Kase Multicoated UV Clip-In Filter for Sony Alpha Cameras is a multicoated filter with coatings to reduce reflections.