Pentax SP 12x50 Porro Prism Binocular is ideal for extensive range of lighting and weather conditions. It is purged with nitrogen to resist internal fogging, also water proof with a JIS Class 6 rating and submersible up to 1m to perform well in all weather conditions. Its Premium multi-layer coating assure the maximum light transmission and deliver bright, crisp, true-to-life images in the widest range of viewing conditions. The large size objective lens of 50mm increases light transmission and offers viewing even in low light conditions. Its BaK4 Prism allows you more depth of field view as compare to roof prism design. The long 11mm eye relief design offered viewer to see entire 97.61m field of view clearly and effortlessly. Its body is slip-resistant, shock-resistant and strongly rubberized to hold binocular more firmly. The large 50 mm objective lenses provide excellent light-gathering capabilities, making them a great choice for viewing wildlife when they are most active at dusk and dawn. Its lightweight rigid body design makes these binoculars extremely rugged to maintain optical alignment.