Sorry for missing the Tamron, but I believe that Sigma came with a new version of the 70-200 (called <span id="ProduktInfo1_LabelProduktTekst2"]Sigma AF 70-200mm F2,8 APO EX DG MACRO HSM II, unsure what the APO means). As far as I heard, it was released last autumn, but I might be wrong. Sigma used to have a good reputation (better than Tamron) in the old days when I was using film and a canon A1. Wonder if that is still trough, though.