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Yes I see what you mean about how close everything has to be.
Well my QHY12 CCD is ~ 30mm diag so a smaller cold mirror is not on.
I would probably have to move the primary mirror closer to the secondary by at least an inch. Don't really want to buy a larger secondary though.
I will have a re-think and learn how to fall in love with an OAG.
Regards
Bill
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