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Secondary mirror size for 30 telescope.(Photography).
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08-08-2016, 03:19 PM
clive milne
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Join Date: May 2011
Location: Freo WA
Posts: 1,443
Depends how big the chip is and how much vignetting you are prepared to accept... A 5" secondary would be fine for a small chip, but you would need a 6" if you intend to cover something like a 16003
clive milne
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