Sea & Sea SS-31114 Zoom Gear for Canon 16-35mm/ Tokina 10-17mm

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Sea & Sea SS-31114 Zoom Gear for Canon 16-35mm/ Tokina 10-17mm
This Sea & Sea Zoom Gear is used to zoom the Canon 16-35mm f/2.8L USM and Tokina 10-17mm f/3.5-4.5 AT-X 107 DX auto-focus zoom lenses when used in Sea & Sea housing.