Capture detailed wide-angle images of coral reefs, caves, shipwrecks, and other underwater wonders with this Nimar Water Sports Dome Port with Zoom Control for your Canon EF 17-40mm f/4L USM Lens. The port features a depth rating of 197′. The clear, dome-shaped front element magnifies images to a lesser degree than a flat port does, and corrects for the underwater size distortion that makes everything appear 25% larger and closer–thereby helping to restore the 17-40mm’s wide angle of view. A knob and ring enable zoom control with your lens.
The front element is crafted from crystal optical glass for superb clarity. Built for durability, the body is made of tough Delrin acetal resin. This port is designed to be used on Nimar Water Sports housings for Canon DSLR cameras, except for those that accommodate the EOS 5D Mark II, 5D Mark III, and 6D. It is attached to compatible housings via the bayonet mount.