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楼主有没碰到这个问题，我是在某些review上看的，想入这个，但不知道这个问题是不是普遍存在这个镜头上？
I am using this lens with Canon 5dmk III. I purchased the lens about three months ago. I was excited with the VC feature on this fast zoom range (one and only?) 24-70.
Then I discovered inaccurate autofocus when I was using the left-most and right-most 3 columns AF points of 5dmk3. Not just slight out of focus but way off. Turned the lens in for service/calibrating. The technician said the lens has not been updated for the latest mk3. After a few days, I got the lens back, tested it, and the same problem still existed. Turned the lens in again for calibrating. Same result. The technician kept adjusting. As we were getting the closer to accurate, the center AF became compromised. Then we set back to default. Accurate center but inaccurate at edge.
Finally, I request for an exchange and they replaced it with another copy. Tessted the new copy, and I discovered the same problem. I talked to the technician and he said no idea why this happening. So they sent my sample images to Tamron Japan and still awaiting for replies until today i wrote this.
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参加征文-我和我的车 (2008-1-31) 大球球 
发表于 2013-12-29 09:23
