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Mick, I think it is purely the optical design. The tolerances for an RC are so much tighter than the manufacture of an SCT. This is not to say the ACF is a slouch. Indeed I have seen plenty of really nice images taken with them. That is most likely the result of the operator using it and the individual optics. However, the hyperbolic design of both surfaces in an RC requires very narrow tolerances and this is the reason for the sharper images. (well in Theory)
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