The EF 50mm f/1.2L USM Lens - Serious Glass for Serious Photographers The EF50mm f/1.2L USM lens is now the fastest autofocus lens in its class, which makes it an essential tool for many professional and advanced amateur photographers. Canon is the only camera manufacturer to provide professionals and advanced amateurs with Digital SLRs that feature full frame sensors, such as the Canon EOS-1Ds Mark II and EOS 5D digital SLRs. The new EF50mm f/1.2L USM lens complements full-frame cameras, while delivering beautiful results on APS-C/H sized sensor models as well. The EF50mm f/1.2L USM lens is a strong testament to Canon's heritage of optical excellence. Every aspect of this lens exudes professional quality from its wide 72mm filter diameter to its dust and moisture sealed construction. A high refraction glass molded aspherical lens element helps to minimize spherical aberration, which is crucial in order to provide fine detail and maximum image quality from corner to corner, even when the lens is used wide open. Full frame digital camera users will especially appreciate the benefits of the 50mm focal length, when shooting waist-up portraits while maintaining appropriate subject distance at a wedding. The large maximum aperture of f/1.2 allows this lens to produce shallow depth of field that softens the background and makes subjects "pop" out of a portrait. Photographers can also take advantage of higher shutter speeds to shoot in lowerlight and help prevent blurring caused by subject movement or camera shake. In addition to a large aperture, the new lens also has blazingly fast autofocus speed and response time, thanks in part to Canon's ring-type Ultrasonic Motor (USM), which quietly drives the lens. A full-time manual focus feature allows photographers to fine-tune the sharpness of their images, even when the lens is set for autofocus. Canon designed the EF50mm f/1.2L USM to deliver the best possible optical quality while being tough enough to meet the needs of demanding photographers. Eight lens elements in six groups provide high resolution, while advanced coating suppresses flare and ghosting. A glass molded (GMO) aspherical element ensures maximum image quality by reducing spherical aberration and linear distortion. Dust and moisture resistant components in the lens mount, switches, and focus ring help to protect the lens in a wide variety of shooting conditions.    Minimum Focus Distance  1.5' (0.45 m)  Magnification  Not specified by manufacturer  Angle of View  46°  Filter Size  72mm  f/Stop Range  1.2-16  Groups/Elements  6/8  Length  2.6" (65mm)  Maximum Diameter  3.4" (85mm)  Weight  1.2 lb (545 g)