Sea & Sea SS-31126 Focus Gear for Canon 60mm F2.8 USM EF-S Macro

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Sea & Sea SS-31126 Focus Gear for Canon 60mm F2.8 USM EF-S Macro
This Sea & Sea Focus Gear is used to manually focus the Canon 60mm f/2.8 USM EF-S macro lens when used in a Sea & Sea housing.