Amongst 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 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.

• Fujinon's best military-specification 7x50 porro prism binocular with a 7.5° field
• Nitrogen-purged waterproof & fogproof lenses
  
• Up to 13 Fujinon EBC multicoatings upon all optical surfaces
  
• 56-74mm Interpupillary adjustment range
  
• Pebbled external finish upon a metal housing (this binocular is NOT rubber armored)
  
• Accepts optional eyepiece filters
  
• Ideal for both boating and astronomy applications
  
• Peel-down style rubber eyecups
  
• Extremely-long 23mm of eye relief
  
• Tripod mountable with optional adapter. 1/4 inch-20 thread