Sea & Sea SS-31151 18-50mm F2.8 EX DC Macro/HSM Zoom Gear For Canon

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Sea & Sea SS-31151 18-50mm F2.8 EX DC Macro/HSM Zoom Gear For Canon
This Sea & Sea Zoom Gear is used to manually zoom the Sigma 18-50mm f/2.8 EX DC HSM Lens when it is used in a Sea & Sea housing.