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I've never actually understood the pursuit of bigger scopes for imaging. Though I can understand going for a bigger scope, but keeping the focal length the same. Once our image scale is at our average level of seeing (fl dependent on pixel size and average local seeing) what is the purpose of going for a longer focal length? There are no gains to be had in extra detail, because detail will be seeing limited ..... AO systems might stretch things a bit, however I think the pursuit of bigger stuff is more about the pleasure of ownership than in getting more information....There are of course lots of fabulous images taken with 16" f8/f6 RC's etc, but I honestly doubt if they would be any better than if they had the same exposure with an 8" RC and were processed with the same level of skill.....
my 2 cents
cheers
Gary
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