This version of Canon's FD 500 mm f/4.5L lens features Canon mount which enables mounting with a simple twist. The lens incorporates BOTH Fluorite and

This version of Canon's FD 500 mm f/4.5L lens features Canon mount which enables mounting with a simple twist. The lens incorporates BOTH Fluorite and Canon's UD (Ultra-low Dispersion) glass for performance that is not only superb, but extremely fast for a lens of its focal length, In addition, this surprisingly lightweight and compact lens features a plano-parallel glass protective flat used as a protective front element. It also features a built-in focus pre-setting mechanism which enables very rapid operation. The tripod mount has been changed to a built-in permanent type design. For sports, nature and surveillance photography, this is an ideal lens even under difficult lighting conditions.