Thread: What Secondary Mirror size for short focus scopes?
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Old 02-07-2012, 06:46 PM
Star Hunter
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Join Date: Dec 2011
Location: Ellesmere, Qld
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What Secondary Mirror size for short focus scopes?
Does anyone know what the oversize secondary mirror size is for a 6" F4 or F5 Newt.?

I'm putting together a short focus scope for digital (full frame) imaging and need the bigger secondary using a Crayford 10:1 focuser. Tube is ~175mm dia.

Perhaps there is a calculator one can add in their specs and bingo! there's the size.

Thanks,

JB
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