Steiner's 7x30 Navigator Pro Binocular is engineered and built to withstand the rigors of life on the water while producing bright and clear images. The relatively small objectives make this binocular fairly lightweight and very easy to handle - even one-handed, while the 7x magnification translates to a wide 370' field of view at 1000 yards. The porro prism optical design combined with the fully multicoated optics provides high-contrast images with true color representation and long depth of field. Each ocular is individually focused for precise customization for each user and will maintain that focus from 65' to infinity - so users can concentrate on the views, not re-focusing.To hold up to the elements, the housing is made of temperature and impact-resistant Makrolon polycarbonate. NBR rubber armoring on the exterior is resistant to oil, acid, and weathering, as well as providing a slip-resistant grip in cold or wet conditions. The optical tubes are nitrogen-filled for fogproof performance, and the Navigator Pro is waterproof to 16'.