1. Extra-Low Dispersion (ED) objective lenses provide high resolution, high contrast images virtually free of optical defects like chromatic aberration (color fringing) 2. Fully multi-coated optics deliver maximum light transmission through the optical path 3. Phase coated BaK-4 prisms produce vivid, true-to-life colors 4. Eyeglass friendly - generous eye relief and sturdy, twist-up eyecups with multiple stops 8.2' close focus Tripod adaptable