Pentax ZD 10x50 ED BinocularsThe Pentax ZD 10x50 ED binoculars feature high end optical elements including fully multi coated optics with anti glare properties, phase corrected BaK 4 prisms, and ED glass that virtually eliminates chromatic aberration which all together produces very bright, clear images with high contrast and accurate color rendition. The larger 50mm lens also draws copious amounts of light to extend the usability in low light conditions for use in dusk til dawn