Steiner Navigator 7x50 Open Hinge BinocularThe Steiner Navigator 7x50 Open Hinge Binocular uses individual focus for each eyepiece. Once you have the eyepieces adjusted for your eyes, your view will be in focus from about 66' to infinity without the need to refocus. Along with the 7x magnification and the 7. 1mm exit pupil, this makes them easier to use on rough water. The open bridge and textured grip make it easier to hold and aim. The Navigator 7x50 is waterproof to 5 meters.