This full aperture filter has a 90mm/3.5” clear aperture Type 2+ glass filter element. It’s mounted in an aluminum cell with a 108mm/4.25” internal diameter to fit scopes with a maximum diameter of 106.4mm (4-3/16”).
It fits all versions of the unarmored Celestron C90, Meade ETX-90, and Questar Standard and Duplex 3.5” Maksutov-Cassegrain telescopes, as well as the Astro-Tech AT80 and AT80ED 3.1” refractors.
You can custom fit it to telescope tubes with an O.D. of 101.6mm (4”) to 106.4mm (4-3/16”) by using the extra supplied self-adhesive felt.
Always remember to install the solar filter before pointing your telescope at the Sun to avoid instant and irreversible damage to your eyesight.
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