This 1.25" eyepiece Baader 3.5nm f/2.0 Ultra-Highspeed H-Alpha CMOS Filter from Alpine Astronomical is 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. in continuation with previous question. So do i need to purchase Alpine Astronomical Baader T-2 90 Prism Star Diagonal Housing separately ?

A: It should come with everything you may need: 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 Limited 2-Year Warranty Alpine Astronomical Baader 2" T-2 Nosepiece Limited 2-Year Warranty I dose not come with eyepieces.

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. 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: 4. I Have An F7 102mm Triplet Refractor From Explore Scientific, If I Purchase This HA Solar Filter What Else Would I Need To Purchase

A: The DayStar Filters QUARK H-Alpha Eyepiece Solar Filter inserts into 1.25" or 2" diagonals and accepts 1.25" eyepieces. I recommend using UV/IR cut filters. Follow this link https://bit.ly/3UpqtKg if you are using a diagonal, or https://bit.ly/494r2gU if you are not. The following energy rejection filter is also recommended for optical tube assemblies over 80mm. https://bit.ly/3vYBecc

Q: 5. Is this zoom eyepiece click-stop? If yes, how many increments?

A: No it does not there are 4 markings 8,12,16 24 it works great

Q: 6. I have a Celestron TrailSeeker 80 spotting scope. It came with its own 8-24 zoom eyepiece. It's fine. But would this different 8-24 eyepiece be an upgrade? Is the quality higher? If so, great. If not, I'll stick with the original.

A: The Celestron 8-24mm Zoom Eyepiece (1.25") BH #CEEPZ824 • MFR #93230 is the same eyepiece that comes with the Celestron TrailSeeker 80 20-60x80 Spotting Scope.

Q: 7. Does this come apart into two pieces like the Orion so you can put one half on the eyepiece and the other on the diagonal?

A: No, it dose not come apart.

Q: 8. 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: 9. Will this work with my old Pentax 500 spotting scope? I currently am using a Meade MA25mm eyepiece.

A: The Pentax SMC XW 10mm Eyepiece (1.25") BH #PEEP10X • MFR #70514 will work with your Pentax 500 spotting scope.

Q: 10. will this work with an ED80T CF Triplet telescope?

A: Just got mine last week and got great views on my old SV AT1010 80mm f6 achro. Just saw black at first then, per the instructions, turned the tuning dial 2 clicks clockwise. In a few minutes i was seeing great chromo and proms as well. I got the front mount uv/ir blocker as i will be using it on a larger scope as well. You won't get a full disc view though because the focal length is greater than 450