I don't know about on the NEX, but I just bought the Sigma 30mm for the E-p2 and the auto focus is quick and accurate, even with face detect on. Forget manual focus though. The focus ring is plastic on plastic and "sticky and grabby". The lens seems pretty sharp, though I have only messed with it for a few test grabs. Today plan to put it to some test shots and family event testing.










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