Canon EF 70-200mm f/2.8L USM Telephoto Zoom Lens for Canon SLR Cameras EF mount; telephoto zoom lens Ultra-low Dispersion glass; inner focusing; full-time manual focus 70-200mm focal length, Closest focusing distance: 4.9 feet f2.8 constant maximum aperture UltraSonic Motor (USM). Compatible with Extender EF 1.4x II and 2x II