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. 100% fits Sigma and does have same construction. Made by metal with very high quality The UNC (Unified National Coarse Thread) is 1/4" Suitable For: SIGMA APO 70-200mm F2.8 II EX DG MACRO HSM
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