The wide angle lens Sigma 24-35mm f/2.0 DG HSM Art stands out to cover the three usual focal lengths (24, 28 and 35 mm) and to have a zoom F 2.0: these are the technical specifications typical of a device of the Art line of Sigma. Its optical design allows you to have a perfect sharpness whatever the set focal length, it manages to minimize chromatic aberrations and is characterized by a relatively small vignetting. It is a truly reliable model that meets the best professional standards. This lens has a unique zoom that manages to cover most of the focal lengths of a wide angle element. It can support Canon, Nikon and Sigma cameras, so there are no big problems regarding compatibility. For firmwire updates it is possible to adopt the Sigma USB dock. The model does not integrate the stabilization of the image and is characterized by considerable size (8.8x12.3 cm) and a high weight (940 grams). In addition, the speaker adds another 3.6 cm to the length. Precisely for this reason it appears to be the largest model of the entire art line. Among the technical specifications of the Sigma 24-35mm f/2.0 DG HSM Art are remembered: - presence of 26 glass surfaces for the reduction of ghosting effects; - The minimum distance for focus is 2.8 cm; - With manual focus 1: 4 enlargements are obtained. You can cancel this setting and move on to automatic focus simply by rotating the special ring; - The filter threading is 82 mm. This feature makes it larger and more expensive than fixed focal lenses.