The Canon EF 70-200mm f/4L USM Lens is a professional zoom telephoto lens suitable for sports and portraiture. It retains the excellent image quality of larger f/2.8 lenses while being smaller and lighter. The lens uses one fluorite and two UD elements to reduce aberrations, has fast autofocus with manual focus override, and works on full-frame and APS-C cameras with a minimum focusing distance of 3.9 feet.