Sea & Sea SS-31138 Focus Gear for the Sigma 10mm F2.8 EX DC HSM Fisheye
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![Sea & Sea SS-31138 Focus Gear for the Sigma 10mm F2.8 EX DC HSM Fisheye](https://d17bck4wpaw2mg.cloudfront.net/att/a/2/i/3/a2i3m6/so6a.jpg)
This Sea & Sea Focus Gear is used to manually focus the Sigma 10mm f/2.8 EX DC HSM Fisheye lens when used in a Sea & Sea housing for Nikon cameras.