This Aqua Tech 50mm Port Extension is designed to allow the use of the Canon 16-35mm f2.8L II lens with the AquaTech LP-3 Large Dome Port for underwater photography. This extension ring features a ball drive and ring gear zoom control allowing the full focal range of the lens to be utilized.
- The extension features a direct drive zoom control
- Medium diamond knurl grip for ease of installation
- Piston seal o-ring on major thread base