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It's not a Fluorite lens. I think it is an older Vixen ED80S F9, I have the same telescope. I have an old Vixen catalogue which has a little bit (not much at all!) of info about the glass types used. I will dig it out and post what it has later.
Last edited by rrussell1962; 19-02-2022 at 08:14 AM.
Reason: Added S to the model.
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