The Tripod Mount Ring B(W)’s main purpose is to provide a better balance when mounted on a tripod.
Since the tripod ring freely rotates, a nice amount of setup flexibility is gained.
With the Tripod Mount Ring B(W) in use, switching from horizontal to vertical orientation is fast and easy.
The thumbscrew tightens/loosens the tripod ring friction as needed.
Simply rotate the ring to the desired position and lock it tight.
If not needed, rotate the ring to an out-of-the-way position when not in use.
Alternatively, loosen the tripod ring and pull out on the thumbscrew to completely release the ring from the lens.
High Quality Made of Aluminium Die Cast
Canon EF 70-200mm F2.8L
Canon EF 70-200mm F2.8L IS
Canon EF 70-200mm F2.8L IS II
Canon EF 300mm F4L IS
Canon EF 100-400mm F4.5-5.6L