[Extra-low dispersion (ED) glass for chromatic aberration compensation and clearer viewing Dielectric high-reflective multilayer prism coating ensures superior transmittance uniformity across the visible range resulting in brighter images and more natural colours All lenses and prisms are multilayer-coated for brighter images Phase-correction-coated roof prisms for high resolution. Close Focus Distance:7.8 feet Long eye relief design provides a clear field of view even for eyeglass wearers]