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Hi Bojan, Many years ago I had an MTO 10/100, very heavy with a two-element Maksutov corrector that must have had the best part of 40mm solid glass up front.
Like yours the primary mirror retaining ring had been screwed up by some Russian gorilla and after releasing that it was optically much improved, but still quite inferior to the little Meade 4” f/10 SCT I had at the time.
When I’m home later this week I’ll try to make a Foucault-gram of the Santel and compare with the interferogram that came with it. It’s strehl is supposed to be 0.965 so will be interesting to see.
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