Sea & Sea SS-31138 Focus Gear for the Sigma 10mm F2.8 EX DC HSM Fisheye

DISCONTINUED
Sea & Sea SS-31138 Focus Gear for the Sigma 10mm F2.8 EX DC HSM Fisheye
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.