Fujinon Nautilus Series Waterproof Binoculars:

• 100% multi-coated optics
• Flat-field, distortion free, high resolution optics: equally sharp from center to edge
• 100% waterproof, O-ring sealed, light alloy housings, dry nitrogen purged
• Rubber armor-coated for high durability
• 50mm - 59mm lens diameter
  
• 7x - 9x magnification