This off-axis filter has a 76mm/3” clear aperture Type 2+ glass filter element. The filter is mounted on a white fiberboard insert in an aluminum cell with a 273mm/10.75” internal diameter to fit scopes with a maximum diameter of 271.5mm (10-11/16”).
It fits all versions of the Celestron 9.25” Schmidt-Cassegrain telescope (C9¼-S, C9¼-SGT, CGE-925, NexStar 9¼, etc.).
You can custom fit it to scopes with an O.D. of 266.7mm (10-1/2”) to 271.5mm (10-11/16”) 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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