Nikon Sports & Marine (7x50) Binocular

The Nikon 7x50 IF Sports & Marine series includes standard and compass models, both totally waterproof, fogproof and shock resistant to survive in the harsh marine environment. Nikon chose individual focus for the 7x50's eyepieces to eliminate the need for constant focusing when most viewing is at longer distances. Each ocular lens is focused to meet the requirements of the user's eyes, then no further focusing is required. If lent to a mate, the skipper can return the focus to his own settings quickly and easily.The optimum ratio between magnification (7X) and objective lens (50mm) delivers an exit pupil of more than the 7mm that will satisfactorily accommodate the human eye during very low light conditions. The result is maximum light gathering at dawn, dusk or fog when navigation markers must not only be seen, but identified for safe piloting in coastal waters, harbors and inlets. The 7X magnification is the power of choice by mariners for steady viewing on the water.The difference between these glasses and