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Amazon.com : Haoge LMR-C347 Lens Collar Replacement Foot Tripod Mount Ring A II for Canon EF 300mm f/4L USM, EF 400mm f/5.6L USM, EF 70-200mm f/4L USM, EF 70-200mm f/4L is USM
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Amazon.com : iShoot Tripod Mount Ring for Nikon AF 80-400mm f/4.5-5.6D ED VR, Lens Collar for Nikon AF-S 300mm f/4D IF-ED Lenses-Camera, Lens Tripod Support Holder with Quick Release Plate fit ARCA-Swiss
Canon 70-300 L tripod collar ring alternatives: Canon SLR Lens Talk Forum: Digital Photography Review
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