The Canon EF 400mm F/4 DO IS II USM Lens is compact, super telephoto lens designed for Canon EOS DSLR cameras. It has a super telephoto focal length of 400mm, which perfectly suitable to cover sports events and wildlife photography. Its dual layer diffractive optics minimizes spherical and chromatic distortion that is usually noticed when working with telephoto focal lengths. The four stop image stabilization system compensates minor movements and helps in reducing shift blur. The AF system of the camera ensures quick, perfect and noiseless focusing.