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Hi Guys thanks for all the answes. I already use CDC etc to work out the FOV. calculation. I was concerned more with the size of the secondary and its limitation on the FOV. The CCD Calculators etc do not account for the size of secondary or so it seems to me. For example A 8" F4 refractor scope and newt scope show the same FOV box for a DSLR camera regardless of the size of the secondary in the Newt. It seems we have to manually account for this. And I see this now thanks.
Regards
Fahim
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