Used the lens mainly for architectural photography. This glass showed itself very well, it behaves especially nicely on the periphery of the frame, when I always had a lot of "soap" on the sigma, which always had to be covered up somehow (mainly by vignetting). Aperture 2.8 for this glass is an indicator of the class of the lens. As a rule, such lenses are made using a more advanced coating than dark optics. Although 2.8 is not particularly in demand, given the wide-angle nature of the optics, in any case, when shooting landscapes, the optimal aperture values \u200b\u200bare 8-11. By and large, given the very small zoom of this glass (11-16), the manufacturer would be better off creating a fix with a focal length of, say, 11 mm, the optics would win even more in quality, since wide-angles are just used at the minimum zoom values, this is their "juice". The sharpness is pleasant, as for a wide-angle lens, in my opinion, the working aperture, with which you can already get an acceptable result - 4. I can safely recommend this glass to those who are fond of landscape and interior photography.
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