iShoot Tripod Mount Ring Base Lens Collar Replacement Foot for Nikon AF-S 500mm f/5.6E PF ED VR - AliExpress
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Amazon.com : iShoot Lens Collar Compatible with Nikon AF-S NIKKOR 200-500mm f/5.6E ED VR, Lens Tripod Mount Ring Support Bracket Holder, Bottom is ARCA Fit Quick Release Plate for Tripod Ball Head
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PXLN1 Replacement Foot for Nikon 500mm PF and 70-200mm F2.8 VRI & VRII with SS2 or QD Strap Port, Arca-Swiss type mount