The EF 200mm f/2.8L II USM employs Canon's famous rear-focus telephoto optical design that delivers outstanding picture quality throughout its entire shooting range - even at middle and close distances. And like its high-end siblings, this lens also uses two ultra-low dispersion (UD) glass elements to ensure maximum image sharpness and accurate color fidelity; and Canon's advanced ultrasonic focusing motor (USM) and rear focusing design for silent, high speed autofocusing. The EF 200mm f/2.8L II USM is perfectly suited for Canon's EOS system cameras, placing special emphasis on manual focusing capabilities. The new 200mm f/2.8L II USM lets you get up close and personal, and still keep your distance. Features EOS compatibility is ensured. EOS-dedicated information such as metering and focal length is transmitted directly through the lens mount to the camera body. Large maximum aperture of f/2.8 allows full use of the cross-type BASIS feature on all EOS cameras from infinity to the closest shooting distance of 4.9ft. (1.5m). Ultra-low dispersion (UD) glass compensates for chromatic aberration and ensures accurate color and sharp, clear images. Ultrasonic Motor (USM) and rear focusing design allow for silent, high speed auto focusing and full-time manual focus. Smooth manual focusing is accomplished through Canon's mechanical manual focusing system and wide rubber focusing ring for easy adjustments. Added focusing versatility through full compatibility with 1.4x and 2x EF Extenders.