Quote:
Originally Posted by ZeroID
....500 f6.3.... On my A77 2/3 sensor it work work out as 750mm .....
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It wouldn't.
500mm FL is always 500mm FL, no matter what size of sensor you have.
However, your field of view would be 1.6x smaller.
Yes, this solution is much cheaper than APO... but good APO will be better in terms of image quality (sharpness - images of individual stars will be smaller and rounder).
It all depends on what you want from your optical system - those Maksutovs are good enough for many tasks ( light collection capability in general).. but many people from this (and other forums) will tell you they are not good enough for what they do ("pretty pictures"). My MTO is 100% adequate for what I want to do with it, though.