Bright f/1.2 aperture L class robust construction Ultrasonic AF motor The Canon EF 50mm f/1.2L USM boasts one of the brightest apertures available on any autofocus lens, making it an excellent choice for shooting in limited lighting or achieving a very shallow depth of field. The professional-level optics and robust, weatherproof construction means professional level bodies will benefit the most from this lens, with high resolution options such as the EOS 1Ds Mark III being a perfect companion. There are a number of other 50mm options available, from both Canon and other manufacturers, but none offer such a bright aperture. Due to the compact size and versatile focal length the Canon EF 50mm f/1.2L USM is useful for street photography and candid portraits. When shooting in low light the f/1.2 aperture keeps the ISO, and therefore digital noise, to a minimum while focus speed is largely unaffected. The robust build and weather sealing of the Canon EF 50mm f/1.2L USM makes it able to survive rain and dust, making the lens a perfect companion for outdoor shooting.