The 4th Generations Designs custom low-profile replacement foot replaces the factory feet on the rotation collar of your lens and serves as an Arca-Swiss style quick-release plate.
This replacement foot makes your lens handle better on a tripod head, makes the lens easier to pack, decreases the overall height of the lens, lowers the center of gravity and features a double dovetail design.
Fits Canon 600 f4 IS and 400 f4.5 Lenses
Please see Resources tab for Lens Foot Compatibility chart.