Yes you are too critical! I do notice a decrease in sharpnessin the corner of the image, but very minimal though, I have to look very carefully to notice that. Now, you need to know that lenses are sharper in the center than in the far corner. Great prime lenses are sharp from corner to corner, great zoom lenses are sharper in the center with a small decrease in sharpness in the corners, cheap consumer lenses tend to have very soft corners and ultra wide angle lenses tend to have very soft corner too. This is the concensul.If you read Bryan's reviews you will notice that he evaluates a lens performance both in the center and the corner, that's why when you take a look at the ISO 12233 crops you will see the crops in the center, mid frame and corner.
You lens is fine, your camera is fine, your focus is also fine. Stop pixel peeping, get over it, go ou there and start shooting! [img]/emoticons/emotion-1.gif[/img][img]/emoticons/emotion-1.gif[/img]
BTW, take a look at Bryan's ISO 12233 crops for the EF-S 17-55mm f/2.8 IS USM.
Nate,
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Originally Posted by Sinh Nhut Nguyen
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