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I dunno... I rekon the a well manufactured RC (RCOS/TAK/A&M) would compete with an equally size refractor. There would be substantial differences in the images produced, but I dare say that nobody would think those differences made one image better than the other (diffraction spikes etc) The APO might have better contrast with no center obstruction... Its really hard to say... Especially for me, someone who does not own a top quality APO, and does not own a RC scope either.
I do know that my C11 captures tightish stars, often when you take into account the different focal lenght, they seem on par with my Megrez.. Provided its been focused accurately..
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