The absolute top of the line, among Konus binoculars, the Konusrex series features the incomparable resolution and brilliance of the Silver Mirror Coating treatment, thus achieving a light transmission as high as 96 percent.The outstanding optical performance of these binoculars is further enhanced by the fully multi-coated lenses with Phase Correction and professional BAK-4 prisms.Phase CorrectedOpen Hinge ConstructionBak-4 PrimsFully Multi-coated OpticsNitrogen FilledLarge EyepiecesLong Eye reliefWaterproofRubber CoveredCentral FocusSilver Mirror CoatingSuper Light WeightExtra Large Eyepieces