I should add that center sharpness wide open is more important to me than corner to corner sharpness when stopped down.
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Canon EOS Digital Rebel XSi | Tamron SP AF 17-50mm f/2.8 XR Di-II LD IF | Canon EF 50mm f/1.8 II | Canon EF 85mm f/1.8 USM | Sigma 70-300mm f/4-5.6 DG Macro | Sigma EF 530 DG Super | Think Tank Photo StreetWalker | Flickr
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