and as a bonus: I really like how it looks, and the hood in the kit is petal With its pros. I bought and use for videography purposes, mainly at weddings. In the arsenal of Canon 50 1.8, Canon 55-250 3.5-5.6. Before buying it, there were still 18-55 is for wide angle. During the wedding shooting day, I had to change all the presented lenses several times, because. so far I have one carcass 550D. When I bought the Sigma AF 17-50mm f / 2.8, I immediately sold the 18-55 . because. focal intersect completely and the need for the latter disappears automatically. After the purchase, I decided as an experiment to shoot the entire wedding with one Sigma AF 17-50mm f/2.8. The experiment turned out to be wonderful. Previously, I often saw the phrase “I don’t want to take it off the carcass” in reviews, now I fully realized it. About three months have passed since I bought it, sometimes at a feast I realize that I filmed a wedding without changing the Sigma AF 17-50mm f / 2.8. The reasons for this: at a focal length of 50mm and an open aperture, it makes quite artistic shots, good bokeh, not fifty dollars, of course, at an open one, but the bokeh is noticeable and sufficient. With the purchase of this lens, I also learned what "ringing sharpness" is. The stabilizer also helps. Summarizing all that has been said, we can quite rightly call the Sigma AF 17-50mm f / 2.8 a UNIVERSAL LENS, because: - very convenient focal lengths, makes it possible to shoot both general plans at a wide angle and artistic ones at 50 mm. - luminous. Great for indoor shooting. - sharp - metal bayonet Different cons: - the stabilizer sometimes taps - due to the metal mount, it’s hard to remove and put on the carcass . it’s hard, you have to make an effort, i. E. don't do it quickly - electronic "insides" that are close to the mount are not covered or protected by anything - a tight zoom, the move, in principle, without jerks, smoothly . but the tightness is felt, you can’t do a smooth zoom, and you can hear friction that can be recorded on the microphone. Though maybe it's just my copy.