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I have a Carbon Fibre C9.25 in a permanent setup. Because of the large temperature differentials I have to re-focus sometimes as often as twice a year. Collimination according to CCD Inspector hasn't moved in the last 6 months.
So maybe its luck of the draw. I've never looked though a high quality refractor and am dying to do so - particularly anything in the 4" - 6" mark. But I expect stars would be smaller and tighter in it. I can't see anything focusing as sharply as a refractor.
Hard choice indeed!
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