SEA&SEA 31174 Zoom Gear for Canon EF 16-35mm F4L IS USM
Use this Sea & Sea Zoom Gear to control manual zooming with your Canon EF 16-35mm f/4L IS USM lens in a compatible lens port, which mounts onto an MDX underwater camera housing. For compatibility information, see MDX System Chart. The gear mounts onto the zoom ring of the lens and is controlled via the focus/zoom dial on the housing. It is constructed from corrosion-resistant aluminum alloy.