Phottix
Tripod Mount Ring for Canon 100mm f/2.8 (Black)
Tripod Collar
The black Tripod Mount Ring for Canon 100mm f/2.8 allows you to balance your lens when using it with a tripod. Rather than allowing your Canon 100mm f/2.8 lens to hang off the front of your camera, secure it directly to the tripod using this mount. It features a metal construction, and the UNC (Unified National Coarse Thread) is 1/4.