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 Radko Marinov ᠌

As a staffer - an ideal option: both a wide angle and a portrait lens with good aperture and, in general, a pleasant to the touch, high-quality thing. Some pros: The model is great. At any aperture value, including 2.8, sharpness is excellent in all focal lengths. The design is of high quality, autofocus in any darkness works immediately and without misses. If, of course, blur is considered "miss" when trying to take a picture in the dark with a second shutter speed handheld, then that's another story . Lenses practically correspond to fluorite in their performance! The picture is super! Got cons: The only drawback for me is the rotating focus ring (it scares me sometimes when you grab it with your hand :)))