The Zeiss Distagon T* f/2.8 21mm ZE Lens for Canon EF Mount EOS DSLR cameras is a precision wide angle lens built with a Carl Zeiss T* anti-reflection coating that yields accurate color and professional-quality, high contrast images without any color fringes. It delivers exceptional results under all lighting conditions. With close focusing of only 8.64" (0.22 m) it is useful for landscape photography and other subjects with dramatic perspectives. The Distagon T* f/2.8 21mm comes with an EF bayonet (ZE) mount for Canon film and digital full-frame SLRS. The large front filter diameter (82mm) allows for the use of standard screw-in filters when combined with a standard lens shade (included).