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Amazon.com : iShoot Metal Lens Collar Tripod Mount Ring Compatible with Sigma 18-35mm f/1.8 DC HSM Art, Lens Support Holder Bracket Bottom is Arca-Swiss Fit Quick Release Plate Dovetail Groove ;?? :
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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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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
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Amazon.com : Sigma 18-35mm F1.8 Art DC HSM Lens for Canon DSLR Cameras with SanDisk 128gb SD Card & Altura Photo Advanced Accessory and Travel Bundle : Electronics
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