Frontier APO 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. The all new Frontier APO offers extreme clarity, flat field vision along with excellent chromatic aberration control for a stunning wide angle image. APO models benefit from Extra-low Dispersion glass for controlled chromatic aberration and the elimination of colour fringing. APO Lenses. Extra-Low Dispersion (ED) Glass. Dielectric Coatings. High Resolution Phase Corrected BAK-4 Roof Prisms. Water Repellent Lens Coatings. Magnesium Alloy Chassis. Close Focus From 2m. Replaceable Twist-Up Eye Cups With Position Stops. Stay-On Lens Covers