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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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iShoot Lens Collar Tripod Mount Ring Compatible with Nikon RT-1 Nikkor AF-S 300mm F/4E PF ED VR & AF-S 70-200mm F/4G ED VR, Bottom Camera Quick Release Plate Compatible with Arca-SwissFit Ballhead
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Amazon.com : iShoot Metal Lens Collar Tripod Mount Ring Compatible with Canon RF 100-500mm f/4.5-7.1L is USM, Lens Support Holder Bracket Bottom is Arca-Swiss Fit Quick Release Plate Dovetail Groove : Electronics
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Tripod Mount Lens Collar for Canon EOS EF 70-200mm f/4L, 300mm f/4L & 400mm f/5.6L Lens – Fotodiox, Inc. USA
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Atoll tripod collar makes camera angle adjustment a breeze, no matter your gear: Digital Photography Review
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Tripod Mount Lens Collar for Canon EOS EF 28-300mm f/3.5-5.6 L IS & 70-300 f/4-5.6L IS Lens – Fotodiox, Inc. USA
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