This 35mm wideangle lens features a brilliant maximum aperture of f/1.4, the largest in its class, along with the superior natural image quality of Canon L-series lenses. An advanced floating mechanism and a ground and polished aspherical lens element achieve extremely sharp, distortion free pictures from infinity to its closest shooting distance of 1'. With ring USM-powered rear focus, autofocus is stealthy and swift. A wide focusing ring provides comfortable manual focus, and the filter ring remains stationary for ease of use with polarizers and other special effects filters.