Amongst the world's greatest binoculars for boating or astronomy applications, the military-specification Fujinon 7x50 FMTR-SX Polaris Binocular transmits an incredible >95% of the light reaching the binocular, and has Fujinon's EBC multicoatings upon 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% fogproof 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.  This "FMTR" version of the 7x50 Polaris only differs from the "FMT" Polaris by its rubber armored exterior.