Frontier ED X Binoculars feature HawkeOs new H7 optics, offering stunning high definition viewing with incredible colour control and phase correction. High performance lens coatings and Dielectric Coated prisms ensure the highest level of light transmission. Frontier ED X models benefit from Extra-low Dispersion glass for controlled chromatic aberration and the elimination of colour fringing. Extra-Low Dispersion (ED) Glass. Dielectric Coatings. High Resolution Phase Corrected BAK-4 Roof Prisms. Water Repellent Lens Coatings. Magnesium Alloy Chassis. Close Focus. Replaceable Twist-Up Eye Cups With Position Stops. Stay-On Lens Covers