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Welcome Shan,
as others have said, F4 is getting pretty precarious for visual use. My 8" F/6 dob works fine without a coma corrector, whereas my 20" F/4 is virtually unusable without a cc. I can't speak from an imaging perspective, but as you've alluded to, there probably isn't a scope+mount combo which is ideal for both beginner-to-advanced visual use and AP down the track. AP is for suckers anyway.... (just jokes!)
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