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Hi Mike,
The Mak Newt design is a good one, particularly in smaller apertures. The difficulty with the design comes about because of the Maksutov Corrector plate at the front of the telescope. It is very steeply curved and very thick, particularly at the edges. This makes the corrector progressively more difficult to make, as the aperture gets larger. Further, as the corrector gets larger, cooling issues get worse, particularly having regard to the fact that the scope is a closed tube design. Generally Mak Newts perform at the best around the 6" aperture size. The largest I know of that is readily available is the Intes Micro MN 86 which is an 8"/F6. The Intes MN 61 (not the same company as Intes Micro, but both Russian) was also sold as the "Orion Argonaut". It is a 6"/F6 Mak Newt and one of the best 6" instruments you will find, of any manufacture or design.
Cheers,
John B
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