17-50mm f/2.8 EX DC OS HSM - Canon EF-S Fit

The Sigma 17-50mm f/2.8 EX DC OS HSM is a Canon EF-mount lens designed for APS-C-format cameras, providing an equivalent focal length of 27.2-80mm for wide-angle to portrait work. The lens features a constant f/2.8 maximum aperture that excels in low-light conditions and enables precise depth-of-field control. Its optical construction incorporates two low-dispersion elements and three aspherical elements that effectively reduce chromatic aberration, distortion, and spherical aberration while enhancing overall sharpness and color accuracy.

The lens is equipped with Sigma's Hyper Sonic Motor for fast and quiet autofocus operation, along with an Optical Stabilizer system that reduces camera shake for sharper handheld shooting. A Super Multi-Layer Coating minimizes flare and ghosting for improved contrast in bright conditions, while the rounded seven-blade diaphragm contributes to smooth bokeh rendering. With a minimum focusing distance of 11 inches and a maximum magnification ratio of 0.2x, this versatile lens suits everyday photography, travel, and portrait applications.