Review on Sigma 17-50mm f/2.8 EX DC OS HSM FLD Lens: Large Aperture Standard Zoom for Canon DSLR - International Version (No Warranty) by Doyun Won ᠌

In general, the lens is worth the money invested. But when buying, you need to look very carefully and test. Instances "every other time": sometimes successful, sometimes with back focus or front focus (which is not a problem if you have a corrector with your carcass), not sharp. When buying a choice, they gave 3 copies, I chose a problem-free one. Lens adjustment, if that is a warranty case and is free of charge. Previously, there was a problem with the fact that the hood was attached "on snot". Now everything is fine. I went to Sigma for almost a year with 17-40L. At first I even missed him, but the pluses of sigma still outweighed. I decided to leave the sigma as Avery Day.