Pentax SP 10x50 WP BinocularsThe Pentax SP 10x50 Waterproof binoculars feature larger objective lenses which are designed for astronomical as well as terrestrial use in any climate. The 50mm lenses are fully multi coated with anti reflective properties that also gather more and improve light transmission along the optical path which works well in low light conditions. With the porro prism configuration you get a richer depth of view as well as more surface area for a comfortable