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Ill second what Carl says. Ive used both a 10"RC and a 12" ACF SCT.
In a practical sence, the RC gave much tighter detail and smaller stars, but the 12" SCT required significantly less exposure time for the same depth, or conversely for the same exposure time the 12" was much better for dim extended targets, a 14" would be noticably better than a 12" again.
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