when I was looking for a dob, I started comparing the pics people were taking on the different sized dobs (8", 10", 12" and 16"), most notably the planets. my searching came to the conclusion was that 12" and up seemed to produce the best images (although I did see some awesome pics taken with a few 10" newts but they were less common). that has got to be somewhat representative of the view at the eyepiece.
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