The Sigma 18-35mm f/1.8 DC HSM Art Lens for Canon EF truly a revolutionary product, the Sigma 18-35mm 1.8 DC HSM is the first wide-angle to standard zoom lens to achieve a large aperture of 1.8. Designed specifically for APS-C sized sensors, the Sigma 18-35mm 1.8 translates to 27mm-52.5mm on a 35mm camera. Tapping into Sigma’s long history of lens innovations, the 18-35mm 1.8 DC HSM incorporates a wide glass-molded aspherical lens with Special Low Dispersion (SLD) glass to compensate for aberrations and curvature at the widest angle. Internal focusing and zooming allow for more usability and functionality. The 18-35mm is ideal for landscape photography, portrait photography, still, life photography, snapshots, casual photography, and close-ups and the Hyper Sonic Motor (HSM) ensures smooth, fast, and accurate autofocusing. The use of Thermally Composite Material (TSC) reduces size and weight but increases the accuracy of the lens construction. Its new Global Vision design works features compatibility with the Sigma USB dock for further customization. A 9 blade rounded diaphragm also creates a beautiful background blur. The Sigma 18-35mm 1.8 DC HSM is a new benchmark in photographic history and a must-have for every camera bag.