Jimsloan where do you get the information that it will produce a sharper image. In most reviews i have read they have been much the same but in others i have read that the Sigma actually was sharper in the middle. Also if you are talking about the F4 10-20 then yes the outer edges were slightly affected but the 3.5 doesnt have the same problems. Have you tried both??
Do you by any chance have a Tokina?
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