Zoom smoothly and seamlessly underwater with this Zoom Gear from Fantasea Line mounted on your Tokina 10-17mm f/3.5-4.5 AT-X 107 AF DX fisheye lens. Designed to fit snugly around the zoom ring of your lens, this gear interacts with the lens dial of your underwater housing. The zoom gear is compatible with the Sea & Sea NX Compact Dome Port and Optical Dome Port II 100 when used with a separately available FML to FNX Lens Port Converter 55G.