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Amazon.com : DSLRKIT Tripod Collar Mount Ring C (WII) for Canon 70-300mm f/4-5.6L : Electronics
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Tripod Collar Mount Ring C (WII) for Canon 70-300Mm F/4-5.6L | eBay
Metal Lens Tripod Mount Ring C (WII) for Canon EOS EF100mm f/2.8 L Macro IS USM - AliExpress
