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Amazon.com : Latest Lens Collar Support Tripod Mount Ring Compatible with Sigma 100-400mm f5-6.3 DG OS HSM Contemporary Lens, Bottom is ARCA Fit Quick Release Plate for Tripod Head Clamp of ARCA-Swiss
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Amazon.com : Tripod Mount Ring, iShoot Lens Collar Socket Compatible with Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary Lens (EF/F Mount), Built-in Quick Release Plate for Tripod Ball Head of ARCA-Swiss Kirk
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