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How do they compare to say pentax takumars, olympus zuikos, minolta's rokkor lenses on a dslr, APS-C and full frame? I have heard these are pretty sharp lenses too. Thanks.
Maybe, this helps partly: I used to adapt the Mamiya A120/4 on a Canon FF camera. Compared to the 120/4 Macro on my Pentax 645D, the Mamiya seems to shine everywhere with its "smooth imaging", be it landscape, macro, portraiture. The Pentax is sharp to death and therefore portraits look less pleasant than say with the 150/2.8.
I recently compared diferent alt lenses on the NEX as I recommended the NEX-6 to a friend who was then in search of a tele. Candidates were the Leica 180/2.8, the Pentax M42 Takumar 300/4, the Pentax 645 300/5.6 and the Sony 55-200. We pointed from tripod to white flowers, and estimated the "tonal resolution (white on white, difficult) and the spatial resolution (fine structures). The Leica won, second the Takumar (which delivers beautiful colors), third the 645 300/5.6 and fourth the Sony zoom. If I had to buy one lens, I would consider the first two, the 645 300 being no slouch.