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Thank you for your replies.
I want to protect the OTA from dust and the like. I had problems in the past with dust in my SCT, even hair - this initially accumulates on the mirror diagonal and then moves onto the secondary or the corrector plate when you rotate the tube for storage...
I would love to have clear UV filter that:
will not degrade the optical path
would seal the tube without restricting it any more than the diagonal does (or the visual back for that matter) - I think 38mm opening.
would not cost an arm and the leg
Joe
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