This full aperture filter has a 279mm/11” clear aperture Type 2+ glass filter element. It’s mounted in an aluminum cell with a 317mm/12.50” internal diameter to fit scopes with a maximum diameter of 316mm (12-7/16”).
It fits all versions of the Celestron 11” Schmidt-Cassegrain telescope (C11, CGE-1100, NexStar 11 GPS, etc.).
You can custom fit it to scopes with an O.D. of 311mm (12-1/4”) to 316mm (12-7/16”) 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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