Uses high quality BK7 crystal glass.
Two different anti-reflective coatings are employed to optimize image quality, one for the exterior and the other for the interior of the Optical Domes. A multi-layer coating is used on the dome exteriors and the interior of the domes are coated with silicon-dioxide to effectively suppress flare and ghosting. As a result, the refractive index of each port is reduced to less than 0.01% and the domes produce extremely high-contrast images.
[ Specifications ] [Dimensions (DIAxD)] 250 x 120 mm / 9.8 x 4.7 inches [Weight] Approx. 2100g / 74.1oz [Depth rating] 100m / 330ft [Construction] corrosion-resistant aluminum alloy (anodized),BK7 crystal glass,(dome) and POM resin (shade) [Accessories] Instruction Manual,Optical Dome Port Cover,Port Case