Sea & Sea Zoom Gear for Canon 8-15mm f/4L Fisheye USM Lens in Port on MDX or RDX Housing

Use this Sea & Sea Zoom Gear to control manual zooming with your Canon EF 8-15mm f/4L Fisheye USM lens in a compatible lens port, which mounts onto an MDX or RDX underwater camera housing. The gear mounts onto the zoom ring of the lens and is controlled via the focus/zoom dial/knob on the housing. It is constructed from a corrosion-resistant aluminum alloy.