Aiming to improve on the default design, the Leofoto CF-03 is a replacement for the original foot supplied with the Canon EF 200mm f/2L IS USM lens. The CF-03 replaces Canon's original lens collar foot and provides a lower profile and a lower center of gravity for a better balance. Two safety stops are located on the bottom of the foot, which prevents accidental lens release when a quick release receiver clamp is partially open