Large objective lens elements provide maximum light gathering capabilities and are perfect for use in low light conditions.;Premium multi-layer coatings assure the maximum light transmission through the binocular. The result is bright, crisp, true-to-life images in the widest range of viewing conditions.;Specialized protective coating repels dust, water and grease to keep your optics clean and your image quality at its peak. (SD Models Only);Rigid body construction makes these binoculars extremely rugged to maintain optical alignment. This ensures comfortable viewing throughout the life of the product.;Waterproof and nitrogen-filled (JIS Class 6) to handle the most extreme weather conditions (submersible to 1m).