Sea & Sea SS-31142 Focus Gear for the Sigma 10-20mm F4-5.6 EX DC HSM
DISCONTINUED
![Sea & Sea SS-31142 Focus Gear for the Sigma 10-20mm F4-5.6 EX DC HSM](https://d17bck4wpaw2mg.cloudfront.net/att/a/2/i/3/a2i3n4/so6c.jpg)
This Sea & Sea Zoom Gear is used to manually zoom the Sigma 10-20mm f/4-5.6 EX DC HSM lens when used in a Sea & Sea housing for any cameras.