Use this Sea & Sea Zoom Gear to control manual zooming with your Canon EF 16-35mm f/2.8 III USM lens in a compatible lens port, which mounts onto an MDX or RDX underwater camera housing.

FEATURES:

• Mounts onto Zoom Ring of Lens
• Rotate Knob to Zoom with Lens
• For Ports on MDX or RDX Camera Housings