Sea & Sea SS-31128 Focus Gear for Sigma 105mm F2.8 EX DG Macro Lens on Canon Cameras

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Sea & Sea SS-31128 Focus Gear for Sigma 105mm F2.8 EX DG Macro Lens on Canon Cameras
This Sea & Sea Focus Gear is used to manually focus the Sigma 105mm f/2.8 EX DG macro lens when used on Canon Cameras in a Sea & Sea MDX / DX housing. The corresponding ports are SS-56201 Macro Port Base and SS-56251 Macro Port 79.