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Amazon.co.jp: iShoot Camera Ring Tripod Seat, Tripod Mount Ring, Lens Support Collar, Lens Bracket Collar, Tripod Socket, Compatible with Canon Canon EF-EOS R Mount Converter Lens Adapter Ring, Compatible with ARCA-SWISS Head /
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Lens Collar Support Tripod Mount Ring for Tamron 100-400mm f/4.5-6.3 Di VC USD (A035) Bottom is ARCA Fit Quick Release Plate - AliExpress
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Discontinued items - Tripod Mount Ring B (B) With Adapter For EF 100mm f/2.8 Macro USM - Canon HongKong
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Canon Tripod Mount Ring C (WII) (for 70-300mm L Lens) | Digital SLR Camera, Digital Cameras, Toronto Canada Digital Camera Store, Aden Camera
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