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All other things being equal, there's not a lot of difference between full apo's and good ED scopes, though even at the centre of the field some CA can often be seen with ed doublets and some triplets. Often the differences between scopes are greater at the field edge.
The Redcat and 61edph are relatively cheap astrographs, good enough for many including me, but some imagers are more discerning - depends on personal preferences.
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