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Old 04-03-2019, 09:29 AM
astro744
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Join Date: Apr 2007
Posts: 803
The primary of a typical 8" SCT is f2 with a f5 secondary giving a f10 system. The Schmidt correcting plate is also a vital component and usually matched or at least oriented (rotated) to give the best optical test result.

You are best to seek professional advice from an authorised dealer.
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