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Sigma TS-21 Tripod Collar for Select Sigma Telephoto Lenses

The Sigma TS-21 is a Tripod Collar Available for APO 135-400mm F4.5-5.6 DG, APO 170-500mm F5-6.3 DG, APO 70-200mm F2.8 EX DG MACRO HSM, APO 70-200mm F2.8 EX DG /HSM, APO 100-300mm F4 EX DG /HSM, APO 120-300mm F2.8 EX DG HSM, APO MACRO 150mm F2.8 EX DG HSM, APO MACRO 180mm F3.5 EX DG /HSM and APO 300mm F2.8 EX DG /HSM.