The DP-230 is constructed from hand crafted materials with an optically coated BK7 glass dome at its core. The surface of the dome element is coated with a magnesium fluoride broadband anti-reflective coating to minimize internal reflections from camera lenses, lettering on cameras, etc. which can be a problem in a bright ambient light situation. This coating yields an amazing 99.7%+ transmissive value for true distortion free images.
Assures a thin water line for over/under shooting, and the optically coated glass surface minimizes water beading.
Designed to offer a lifetime of service and extend far enough to protect the dome when placed face down.