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Amazon.com : Tripod Mount Ring, iShoot Lens Collar Support Compatible with Canon EF 100mm f/2.8L Macro IS USM Lens (Replace Canon Tripod Mount Ring D), Built-in ARCA Type Camera Quick Release Plate
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Canon Tripod Mount Ring A II for 70-200mm f/4L 1695B001 B&H
Nikon RT-1 Tripod Mount Ring For 70-200mm f/4G Lens 4981 B&H
