canon 10-22 corner sharpness

Started Jul 9, 2010 | Discussions thread
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Re: canon 10-22 corner sharpness
In reply to jongpl, Jul 13, 2010

sure looks like decentering problem (or other lens problem) and definitely NOT camera movement. Also agree with you that this is not a DOF problem. The left and right sides are so far away that they should be equally sharp.

I have seen something similar in the 15-85 in the WA range at long subject distances, not as bad as this though. It varies a bit between shots, and in both copies that I tried it was clearly worse on one side or corner of the image. With the 15-85 I also notice this sometimes with IS turned off, so I guess it is related to some 'play' in the focusing mechanism that causes slight misalignment.

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