The P-110 Flat Lens Port from AquaTech fits and protects the Canon 16-35mm f/2.8 L or Nikon 17-35mm f/2.8 lens, screwing onto Delphin and Elite Underwater Sport Housings. The port has a depth rating of 33'. Its front element and body are constructed from acrylic, and its base is made of aluminum. Additionally, the front element features a Scratch Abrasive Resistant (SAR) coating. The P-110 is mechanically sealed using no adhesives. A zoom gear, available separately, is required for zoom control with either lens and enables access to the full zoom range.