Subal Lens Ports
Front ports especially depend on hardness and dimensional stability. Therefore most SUBAL ports are made of polyacetal resin. With the larger dome ports a seawater-resistant light metal alloy is used and are then subject to the hard-coating process. The quality of your underwater photos depends on the material of the “windscreen”, which is why all SUBAL flat and dome lenses are made of perfect optical quality glass, which are also coated internally for optimum light transmission and better contrast performance.