Hello Pentax friends, Not so long ago I started using Pentax gear. Apart from the screw mount lenses there seem to be three (?) different K-mount lenses: K, M, A. Apart from the period in which they were constructed, is there a difference in quality, both mechanical and optical, as well? If I would buy a 15, 28, 50, 85, 135 and 200, what would be the best buy (if money is no issue...hahaha)? Thanks a lot!
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