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[ATM] Dumb Cassegrain question

Hi,  I've been looking at ATM Cassegrain designs including classical as well as Nasymth (spelling?).   It seems like grinding the secondary and testing are the two points of greatest difficulty over a Newtonian.    Could a "classical type" Cassegrain  be made with a flat secondary and a powermate type barlow instead of a convex secondary?   This is probably an incredibly dumb question  ...   Thanks.

Clear Skies,

     Chuck
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