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Amazon.com : iShoot Tripod Mount Ring, Lens Collar Support Compatible with Sigma 100-400mm f/5-6.3 DG OS HSM Contemporary Lens (EF/F Mount), Bottom is ARCA Quick Release Plate for ARCA-Swiss Fit Tripod Ball
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Amazon.com : Sigma 729955 100-400mm F5-6.3 DG OS HSM Contemporary Full Frame Telephoto Lens (Nikon) Bundle with 7 YR CPS Enhanced Protection Pack : Electronics
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