Quote:
Originally Posted by toyos
Why would someone choose an 8" f/9 RC with 40-45% central obstruction over say a 5" f/7 APO refractor with a field flattener & zero central obstruction??
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The 8" RC with a 45% CO will have 200% the light gathering capability of a 5" APO. A Better comparison will be against a 7" APO.