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I have an "oversize" 3.1" secondary on my 16" F4.5. Avoids any edge problems with the secondary.
I have a minimal size 1.3" secondary on my 8" F6 travel scope. I can notice some minor difraction effects from the secondary edge when using ep's with 24-27mm field stop size.
Both mirrors are from a reputable supplier - Protostar.
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