This large aperture, super high image quality telephoto zoom lens provides performance comparable to that of a single focal length lens, with a wide zoom range. This lens is developed as a successor to the EF 80-200mm f/2.8L. Its major features include: a ring USM (Ultrasonic Motor) drive, built-in full-time manual focusing, short minimum focusing distance of 1.5m, high marginal illumination, and compatibility with Extenders EF1.4X and EF2X (extends the zoom range with AF to 98-280mm f/4 or 140-400mm f/5.6 respectively). Although this is a large aperture telephoto zoom lens, it is equipped with four low refraction/low dispersion UD (Ultra-low Dispersion) glass lens elements (2nd, 3rd, 11th & 13th) that offer excellent contrast and sharpness. This is a lens that deserves to be known as a super high performance telephoto zoom lens.