Opticron Marine 3 Series binoculars and monocular exemplify our commitment to provide quality, innovation and choice. Each instrument has been specifically designed and manufactured to meet the toughest performance criteria demanded by the enthusiast and professional user alike. Available in either 7x50 binocular or monocular, the models feature enlarged porro prisms and anti-reflective multi-coatings to maximize field of view, cross-field resolution and low light performance. Long eye relief eyepieces and large depth of field provide the best chances for stable, comfortable viewing under constant motion with or without glasses. Fully nitrogen gas filled waterproof, the instruments are protected from knocks and bumps with specially mounted prism assemblies, strong single die-cast aluminum bodies and durable thick rubber armoring.