I sold Canon's 70-200mm f2.8 is ii in favour of this on the basis of reviews I'd read and wasn't disappointed. Same quality, and more convenient focal range on a APS-C sensor than the 70-200.

Haven't had it for long but absolutely love it so far! No problems with front focussing with mine (thank God! I got a bit scared by other reviewers who repeatedly pointed out thi issue). Quiet, fast, and very good feel. Very happy to have spent the...

Not really a bad point, but my other Sigma lens (18-50mm f2.8 HSM) has a neat little auto /manual focus switch, which is easier to reach and operate then the in-built one on my camera body (Nikon D90). Dont know why Sigma haven't added one like this to...