Zen 230mm Superdome Dome Port for Subal Type 4 Housings
Full-frame shooters rejoice! With the DP-230 port, you will finally have a port that will do justice to your expensive rectilinear wide angle lenses like the Canon 16-35mm f/2.8 L, Canon 16-35mm f/2.8 L2, Canon 17-40mm f/4 L, Nikon 16-35 f/4 VR, and the Nikon 17-35mm f/2.8.
Like all Zen Underwater ports, the DP-230 is handcrafted from the finest materials and represents state-of-the-art design and optical technology. Like the highly acclaimed DP-200, it begins with a BK7 crystal glass dome. This yields outstanding optical performance, easily equivalent to or surpassing any other dome currently available at any price. The large radius assures a thin water line for over/under shooting, and the glass surface minimizes water beading.
The interior 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.
The exterior is treated with a proprietary scratch-resistant coating to control lens flare. This coating yields an amazing 99.7%+ transmissive value for true distortion-free images.
The DP-230 is the port you have been waiting for with its exceptional image quality from a full-frame camera.