The Navigator Pro series is the choice for charterers, water sports enthusiasts, weekend anglers and hobby sailors. It offers exceptional performance for the price with many of the features found on premium, world-famous Steiner marine binoculars. They are reliable, simple to use and boast legendary Steiner ruggedness.nnNavigator Pro 7x50 delivers excellent image clarity, sharp definition and contrast. 50 mm objective diameter for bright pictures in low light.nNever compromise performancennSerious optics for those who take recreational time on the water seriously,with the clear image, total reliability and remarkable value Steiner marine optics are known for. Because it's fun.