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Canon Tripod Mount Ring B (W) (70-200 F/2.8L/IS, 300 F4L, 35-350 F3.5-5.6L),

Amazon.com : Tripod Mount Ring, iShoot 78mm Lens Collar Support for Canon EF 70-200mm f/2.8L is/II/III USM, 100-400mm f/4.5-5.6L is USM and 300mm f/4L is USM Lens, Built-in Arca-Swiss Type Quick Release,

Amazon.com : Tripod Mount Ring, iShoot 78mm Lens Collar Support for Canon EF 70-200mm f/2.8L is/II/III USM, 100-400mm f/4.5-5.6L is USM and 300mm f/4L is USM Lens, Built-in Arca-Swiss Type Quick Release