Sea & Sea Focus Gear for Canon EF 100mm USM Macro in DX Port
This gear when used with the Sea & Sea DX Macro Port Base and the Sea & Sea DX Macro Port 50, utilizes the zoom knob on the housing for manual focus control.
Also available as a DX Macro Port Set, including the Macro Port Base, the Macro Port 50, and the Focus Gear.
Canon EF 100 USM lens pictured is not included.