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Amazon.com : iShoot Lens Tripod Mount Ring for Nikon RT-1 Nikkor AF-S 300mm F/4E PF ED VR and 70-200mm F/4G ED VR -with Quick Release Plate : Electronics
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Amazon.com : JJC Tripod Collar Mount Ring, Compatible with Canon EF 70-200mm f/4L /EF 70-200mm f/4L is/EF 70-200mm f/4L is II USM Lens, Replaces Tripod Ring A-2 : Tripod Lens Mount Rings :
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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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Tripod Mount Ring Base Lens Collar Replacement Foot for Nikon Z 100-400mm f/4.5-5.6 VR S & 70-200mm f/2.8 VR S Z Mount Lens
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