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Amazon.com : iShoot Tripod Mount Ring Base, Lens Collar Foot Support Stand Compatible with Canon RF 600mm F11 IS STM and Canon RF 800mm F11 IS STM, Lens Holder with 39mm Arca-Swiss
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Amazon.com : Duomianshou Metal Lens Collar Replacement Foot Tripod Mount Ring Base Support Stand Compatible with Canon RF 600mm F11 is STM and Canon RF 800mm F11 is STM, Lens Support Holder
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Amazon.com : Lens Collar Foot Tripod Mount Ring Base Compatible with Sigma 60-600mm f/4.5-6.3 DG OS HSM Sports, 70-200mm f/2.8 DG OS HSM Sports, 500mm f/4 DG OS HSM Sports, 150-600mm f/5-6.3
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Amazon.com : Fotodiox Pro Lens Mount Adapter Compatible with Canon FD & FL 35mm SLR Lens to Canon EOS (EF, EF-S) Mount D/SLR Camera Body - with Gen10 Focus Confirmation Chip and
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Amazon.com : iShoot Lens Tripod Mount Ring for Tamron 100-400mm f/4.5-6.3 Di VC USD (A035), CNC Machined Lens Collar Support Bracket Holder, Bottom is ARCA-Swiss Fit Quick Release Plate for Tripod Ball
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