Sea & Sea for Optical Performance:
Compared with conventional acrylic material or optical glass, PLANEX produces superior or better optical performance. With high-precision injection molding methods, Sea & Sea has succeeded in producing a dome that has the same curvature as a concave meniscus lens (see note below). The 210 AR dome's optical distortion is as small as that of optical glass lenses. When used with an internal correction lens, the best image quality required for high-end cameras can be obtained. The dome is treated with a multi AR coating to prevent internal reflection from occurring.
Strength performance: Because of PLANEXT's exceptional cohesive strength (Charpy impact strength) and due to a newly designed base, the dome ports' depth rating is now 330' (100m). Compatibility: Compatible with all the wide-angle conversion lenses on the system charts posted on SEA&SEA's website. The Universal Dome Port (UDP) 120 AR is designed with a housing bayonet mount that is easily replaceable. An additional bayonet compatible with a current popular housing manufacturer is also included for user versatility. Dome replacement: The UDP 210 AR has been designed with usability in mind. The dome can be quickly and easily replaced by the user in any environment, therefore even if due to an unfortunate incident domes can be replaced on the spot.
The UDP 210 AR measures (Dia. x D) 10" x 4.2" (250mm x 104mm) and weighs 46.2 oz. (1,310 g) on land. Constructed from corrosion-resistant aluminum alloy with an anodized and anti-reflective coating, dome is a special optical resin with the shade made from ABS resin.
Note: Lens having convex curvature on one side and concave curvature on the other side.
