Among the world's greatest binoculars for boating or astronomy applications, the military-specification Fujinon 7x50 FMT-SX Polaris Binocular transmits an incredible >95% of the light reaching the binocular and has Fujinon's EBC multi-coatings on every optical surface. It is also equipped (as is any Fujinon Polaris series binocular) with flat-field, distortion-free eyepieces that accept optional filters and are ideal for astronomy applications. The 100% fog and waterproof 7x50 Polaris withstands drastic temperature and humidity changes with ease, has abundant eye relief for use with sunglasses in bright conditions, and is simply the brightest, highest-resolution 7x50 boating binocular money can buy.