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New 10" GSO Cassegrains have arrived, pondering
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02-04-2020, 09:09 PM
gregbradley
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Join Date: Feb 2006
Location: Sydney
Posts: 17,903
I agree with Colin. The longer the F ratio I would imagine the more forgiving the optics are for tilt and also for chromatic aberration. Just like camera lenses.
Greg.
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