Lean and PowerfulGet ready to capture the action. The Ef 600mm f/4L Is Iii Usm offers professional and advanced photographers the excellent image quality of a Canon L series super telephoto lens and is the world's lightest 600mm f/4.0 lens. For brilliantly clear results even in challenging situations, Super Spectra Coatings (Ssc) and Air Sphere Coatings (Asc) help minimize ghosting and flare. The inclusion of heat-rejecting paint and two-layer barrel structure helps you shoot longer even in hot weather. Usability is further improved with a shorter minimum focusing distance, full-time manual Af and two easily selectable focus presets to help you quickly dial in the shot you want. Highly versatile, the Ef 600mm f/4L Is Iii Usm makes it easy to bring the action clear and up close in virtually any situation.