400mm fixed focal length
One Super-UD (Ultra-low dispersion) glass element, one UD glass element
7 elements arranged in 6 groups
Inner focusing mechanism with USM (Ultra-Sonic Motor)
77mm filter thread specification
EF 400mm f/5.6L USM
This super-telephoto lens has a prime focal length of 400mm and a max aperture of f/5.6. The lens is built with one Super UD (Ultra-Low Dispersion) glass element which is near fluorite class and one UD glass element. The lens has to its credit inner focusing mechanism and USM (Ultra-sonic Motor) for fast and quiet focusing.
This high-performance lens was designed with portability and handling ease in mind. One Super UD-glass element, whose characteristics are similar to fluorite, and one UD-glass element result in sharp pictures from corner-to-corner. The lens also has a built-in hood and a detachable tripod mount.
Focal Length & Maximum Aperture
7 elements in 6 groups
Diagonal Angle of View
Inner focusing system with USM
Closest Focusing Distance
3.5m / 11.5 ft.
Max. Diameter x Length, Weight
3.5" x 10.1", 2.8 lbs. / 90.0 x 256.5mm, 1250g