I bought this lens after going to my local camera story to but the canon 100-400. I liked the construction, much lower price and after trying both on my cameras there didnt seem to be much difference in pic quality. When the sigma focuses I can get sharp images for my purposes. I've also messed up quite a few shots at long focal lengths, which is why I bought the lens. I almost went back to but a used Canon 100-400 but still didnt like the push pull design. Sigma just came out with a new 50-500 with os that is getting great reviews for the price of the canon.. might consider that. For now I shoot the sigma on a tripod, f8 to f11 low iso and no filter... pics have been ok in this regard.


