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Amazon.com : iShoot Metal Tripod Mount Ring Lens Collar Compatible with Sigma 18-35mm f/1.8 DC HSM Art, Lens Support Holder Bracket Bottom is Arca-Swiss Fit Quick Release Plate Feature : Electronics
Lens support for Sigma 18-35 f/1.8, Olympus 12-100 and 75-300: Micro Four Thirds Talk Forum: Digital Photography Review
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iShoot Lens Collar Support for Sigma 18-35mm F1.8 DC HSM Art Tripod Mount Ring Canon Nikon Sony Mount IS-SM1835
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iShoot Lens Collar Tripod Mount Ring Support Holder BracketCompatible with Sigma 105mm f/1.4 DG HSM Art (EF/FX/FE/L Mount) & Sigma 100-400mm f/5-6.3 DG DN OS (E/L Mount) Lens, Bottom is Arca Fit
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Amazon.com : Tripod Mount Ring Lens Collar Support for Sigma 135mm f/1.8 DG HSM Art Lens(for Canon EF and Nikon F Mount), Built-in Arca-Swiss Type Quick Release Plate for Tripod Ball Head :
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Amazon.com : Lens Support Collar Tripod Mount Ring for Sigma TS-31 AF APO 50-500mm F4.5-6.3 DG OS HSM, AF APO 120-300mm F2.8 DG OS HSM, AF APO 120-400mm F4.5-5.6 DG OS HSM -
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Amazon.com : iShoot Lens Collar Replacement Stand Foot Tripod Mount Ring Base Compatible with Sigma 150-600mm f/5-6.3 DG OS HSM Sports, Lens Support Holder with Arca Fit Quick Release Plate Dovetail Groove :
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