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Originally Posted by Wojciech Drzazgowski
Yea, unless you've bought it recently and you can return it. Perhaps it's under warranty? So you can send it back for re-calibrating by Sigma, which might help a lot.
Although I have a very good operating 50mm 1.4 from Sigma I must say that I get more and more convinced by others that Sigma's AF system/control/calibration really has major issues like 70%? of time...too often at least. And Sigma gets less credit from me, however if you do manage to get a good copy, you can be a very happy owner.
Or get me a proper Canon lens instead
If you're looking in approximately the same budget, take a look at the Tamron 17-50(the one without vibration control/image stabilization, VC) The Canon alternatives are somewhat more expensive [:@]
Jan
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