Quote Originally Posted by Cozen


I notice at 135mm, which is what I shoot at a lot, the center focus can be a little soft. And the corners are really soft. Is this typical of the 28-135 or did I get a faulty one?
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On a FF body in the135mm zoom position,the focusfrom f8 to f11 is as sharp as many "L" lens, with f8being its sharpest from corner to corner. At and above f22 it starts to become very soft in the corners. At the wide end, 28mm, the lens is sharp from 5.6 to f16 corner to corner.


Hope this helps.