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A Mak may be sharper than a SCT of equal aperture but the SCT will generally give a brighter image due to enhanced coatings such as Celestron's Starbright XLT.
FWIW I've owned a 7" Mak, several 6" Maks and a few SCTs. Currently I own a C8 and a C6 but no Maks. SCTs aren't perfect but I prefer their deep sky performance over a typical Mak.
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