Hubble is a bad example - no atmosphere.
I agree with you - as I said, central obstruction is not a problem in bigger scopes.
as long as the optics is good enough to outperform the atmosphere, the result will be as good as you can get. As Mark's post showed, a Newtonian with a corrector can do as well as anything.
Last edited by Shiraz; 22-11-2013 at 05:34 PM.
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