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If you tell me the f-ratio of MN-66 I can reverse-engineer the design and show you Zemax plots.
Yes, Maksutov Newtonians suffer from both residual field curvature and coma, unless made in a bit special way (Wright variant with oblate primary), which I think is not the case with MN-66. But at f/6 (which I'm guessing is the second 6 in 66) aberrations will be moderate, depending how far you go off axis.
How big is the chip you intend to use ?
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