New Hejnar Photo Quick Release foot replacement for:
Canon EF 400mm f2.8L-IS
Canon EF 600mm f/4L-IS
Canon EF 800 f/5.6L-IS
To remove the Canon foot, use the M3 hex key tool that comes with the H110 to completely remove the four Canon mounting screws.
To install the H110, use the four original Canon screws and secure foot to the lens collar.
If your mounting screws loosen over time, consider using of LocTite 242 for security.
It is the best quick release system for tripods and monopods when combined with Arca style ball head and quick release clamps. International standard dove-tail rail, compatible with Arca-Swiss type quick release clamps