Brand Canon Focal Length Description 50mm Lens Type Telephoto Compatible Mountings Canon EF Camera Lens Description Canon EF 50mm f/1.4 USM Standard and Medium Telephoto Lens for Canon SLR Cameras, Fixed Maximum Focal Length 50 Millimeters Standard focal length 50 millimeter lens is effective in a multitude of shooting situations and ideal for day-to-day shooting Elements, Groups: 7 by 6, Diaphragm: Blades 8, Filter Thread: Font 58 millimeter. Minimum focusing distance: 17.8 inch An f 1.4 maximum aperture provides clear imaging in low light situations and shallow depth of field Ultrasonic autofocus motor (USM) operation is fast, smooth and virtually silent 2 high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference This large aperture standard prime lens has superior peripheral brightness even at the maximum aperture Lens construction: 8 elements in 6 groups, Filter size: 77 millimeter Optimized for Digital – super multi-layer coating minimizes flare and ghosting – a common problem of digital cameras The optimum optical design and molded glass aspherical lens elements provide excellent correction for all types of aberrations, including coma aberration, resulting in superior optical performance The Hypersonic Motor (HSM) ensures silent, high speed auto-focusing as well as full time manual focusing capability