This large aperture, super high image quality telephoto zoom lens provides performance comparable to that of a single focal length lens, with a wide z

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. 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