This 65 x 65mm square, unmounted Baader 6.5nm H-Alpha CMOS Filter 65x65mm Unmountedfrom Baader 6.5nm H-Alpha CMOS Filter 65x65mm 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 planeoptically polished, and has Life-Coat sealed edges. It is equally suitable for use with modern CMOS sensors as for older CCD camera technologies.

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

• 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. the sony sensor filter stack has two separate filters. One is a clip frame, the other is glued on. Should we remove both?

A: The glued filter is the actual IR filter, I believe, but you need to contact Sony for confirmation--they don't have much information available about that.

Q: 2. Will this work on an Orion Astroview 120ST (600mm, f/5)? If so, will I need any additional adapters or extension tubes (for focusing)? Thank you.

A: The DayStar Filters QUARK H-Alpha Eyepiece Solar Filter (Prominence) BH #DADSZ4P • MFR #DSZ4P simply inserts into 1.25" or 2" diagonals and accepts 1.25" eyepieces. This design enables the use of nighttime telescopes for solar viewing. In addition to the tunable H-alpha filter, the Quark also functions as a 4.3x Barlow lens, with a 2-element lens system designed to be telecentric which flattens the field of view and reduces parallax, and optical coatings that are optimized for the 656nm H-alpha wavelength.

Q: 3. 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: 4. I have a Apertura 75Q petzval design with internal lenses and flattener technology. will this Daystar DSZ4C be compatible?

A: The DayStar Filters QUARK H-Alpha Eyepiece Solar Filter (Chromosphere)will fit in any telescope that accepts 1.25 inch eyepiece. It works best with refractor telescopes that are between f4 and f8.

Q: 5. 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: 6. 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: 7. 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: 8. 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.

Q: 9. 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: 10. Can you use the CPL from the Nisi v5 pro kit with the newer v7 filter holder?

A: No, the older CPL for the V5 holder does not fit the new V7 holder.