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High Quality 77mm Metal Tripod Mount Collar Ring B (w) For Canon Ef 70-200mm F/2.8l /ef 100-400mm F5.6 / Ef 35-350mm F5.6 Is Usm - Lens Adapter - AliExpress
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Canon Tripod Mount Ring B(W) for Canon 70-200mm f/2.8L, 70-200mm f/2.8L IS, 300mm f/4L, 35-350mm f/3.5-5.6L Lens at KEH Camera
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Amazon.com : DSLRKIT Tripod Mount Ring B (W) for Canon 70-200mm f/2.8L is II USM & EF 100-400mm f/4.5-5.6L is USM : Electronics
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