Canon EF series L USM Telephoto lens with an aperture of f/2 is compatible with Canon SLR cameras. This Canon lens is capable of being used with Auto focus. It contains 10 elements in 8 groups and features a focal length of 135 mm. The lens is compatible with 72 mm filters. It has 8.1 cm diameter, 11.2 cm length and weighs 771 g.