PLEASE NOTE THIS WILL NOT FIT THE
CANON EF 100mm f2.8 macro usm lens only the lens listed, the IS version, if uncertain please contact me
The tripod mount ring mount on the tripod, it helps you fix and balance your tele lens which is heavy or long lens hanging off the front of camera.
Right weight and strong building by third party. 100% fits for Canon and does have same construction.
Ring diameter inside : 68.5mm
Ring breadth: 17.8mm
Ring thickness: 6.1mm
The UNC (Unified National Coarse Thread) is 1/4
Canon EF 100mm f/2.8L Macro IS USM LENS