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I have MTO-100A , Rubinar F10/1000 and Macro Rubinar F8/500 (all catadioptric maksutov design).
They are excellent visual instruments. photographically a bit unsharp.. but only at pixel level.
Portability is excellent (very light and short for focal distance).
Of course, I removed focus stops, so they are no limited now for film (sensor) focal plane only, I can focus them with almost any eyepiece.
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