The Distagon T* 2,8/21 is a super wide-angle lens and is the leader in its range. Thanks to its aperture of 2.8 and its non-reflecting and virtually distortion-free characteristics, it will help you create spectacular compositions full of variety, dramatic contrast and deep, vivid colors. Focal Length 21mm Max Aperture f/2.8 Coverage 35mm Full Frame Lens Mount Nikon F, Leitax Canon EF Min. Focus 8.6" Front Dia. 80mm OD, 77mm Filter (w/ Cine-Mod) Length 4.4" Weight 1.5 lbs.description