Sea & Sea SS-31144 Focus Gear for the Sigma 18-50mm F2.8 EX DC HSM Macro

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Sea & Sea SS-31144 Focus Gear for the Sigma 18-50mm F2.8 EX DC HSM Macro
This Sea & Sea Zoom Gear is used to manually zoom the Sigma 18-50mm f/2.8 EX DC HSM Macro lens when used in a Sea & Sea housing for any cameras.