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 Xander Kio Zion ᠌

Very good value for money. Bought through the Internet, ie. could not check. However, so far no complaints about the quality of the lens! Its pros: Great! A clear picture over the entire range of focal lengths, quite tenacious focus, very good aperture, excellent focusing speed. Great stabilizer! Excellent workmanship and set. Even redundant equipment (wardrobe redundant). I enjoy the lens! Has cons: The focus ring rotates. You cannot focus manually without switching the AF / MF mode with a toggle switch. But it's tolerable. The main thing is not to forget about this feature.