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A couple of C8's I owned... on bright stars a fuzzy "circle of least confusion" is all they showed, never saw a clear diffraction pattern in 2-3 years of visual observing. Quite disappointing considering what I spent on them. Switched to an 8" f/6 newtonian dob, which is distinctly better optically.
A mate has an old Dynamax 8"... now that is a real disappointment and he doesn't take it out often, though he hasn't the heart to swap it for something better.
I'd have to try first before considering an SCT again.
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