Title: returned
Product review: I returned the lens today. Tried it extensively on a Rebel XSi. Maybe I had one of the bad copies. The sharpness was barely acceptable in the center. The corner sharpness was terrible. The images from the "cheap" 18-55 IS kit lens included with the XSi blow the ones taken with the Sigma flat out of the water. I will not take the chance and get another. Too much hassle and frustration. In my opinion it is not acceptable for a company like Sigma to have such sloppy quality control.
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