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Fotodiox Pro, Premium Grade Tripod Lens Collar for Canon EOS EF 100mm f/2.8L Macro is USM Lens, as Canon Tripod Mount Ring DThe Canon Tripod Mount Ring is the tripod collar for the Canon EF 100mm f/2.8 IS Macro Lens. By adding a tripod collar to your lens you can achieve a better balance on a tripod. The tripod ring also makes a big difference in m..