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Amazon.com : iShoot CNC Tripod Mount Ring for Sigma 135mm f/1.8 DG HSM Art Lens, Aviation Aluminum Lens Tripod Collar Support Bracket Holder with Quick Release Plate Compatible with Arca-Swiss fit Tripod
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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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