Wide-angle lens for Canon APS-C cameras (equivalent to 38mm on a full-frame camera) Slimmest and lightest lens of the EF-S series Circular aperture (7 blades) delivers beautiful, soft backgrounds Full-time manual focus allows manual focus adjustment while in One Shot AF mode Minimum focusing distance of 0.5 ft./0.16 m; maximum magnification of x0.27 EF-S Mount Lens/APS-C Format 38mm (35mm Equivalent) One Aspherical Element Optimized Lens Coatings STM AF Motor Supports Movie Servo AF Micro-Stepping Drive Aperture Mechanism Full-Time Manual Focus Override Rounded 7-Blade Diaphragm Slim Design Measures Less Than 1-Thick