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Secondary Mirror Size

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Posted by Marty on January 25, 2001 17:04:43 UTC

Preparing plans for a 8" f/6. I have figured the ideal secondary size to be 1.68". Please correct if in error. The problem is the supplier I plan to use has sizes 1.52 and 1.83. I understand that if I go to big I lose contrast and clarity. If I go to small I lose some field of view. I believe I would prefer the smaller field of view. Can anybody tell me about what percent of view I would lose? I guessing at about 9 percent. Is this acceptable?


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