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Hi C. Asimovs shots are about the best I've seen from an acromatic refractor and unless your investing thousands on an apochromat I'll assume the 5 inch you're considering is an acro like Asi's. The 5 inch will not be able to achieve the same detail due to lesser resolution. Let's hope the filter Asi's trialling will help, but failing that if it's planetary imaging you're after and you're on a budget I'd recommend getting say an 8inch reflector.
cheers,
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