The Fisheye Dome Port 240 from Sea & Sea is a versatile, high-quality dome port for an underwater housing. It's suitable for a broad array of wide-angle, full-frame lenses. The base and frame are constructed from a corrosion-resistant, anodized aluminum alloy with an anti-reflective coating. The dome itself is made of acrylic. Two shades, one on either side of the dome, are composed of tough ABS resin and work to further minimize reflection and glare, thus improving visibility and image quality. The dome port 240 boasts a depth rating of 262.5' (80 m).