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iShoot Lens Collar Tripod Mount Ring Compatible with Canon EF-EOS R Mount Converter Adapter Ring Basic Model, Lens Support Holder Bracket Bottom is 39mm Arca-Swiss Fit Quick Release Plate Dovetail: Amazon.co.uk: Electronics
Re: RF 100-500 tripod collar won't lock down lens: Canon EOS R Talk Forum: Digital Photography Review
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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: Amazon.co.uk: Electronics & Photo
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