Hawke Frontier APO Full-Size Binoculars - 10x42 - 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 color fringing. Features APO Lenses Extra-Low Dispersion (ED) Glass Dielectric Coatings High Resolution Phase Corrected BAK-4 Roof Prisms Water Repellent Lens Coatings Magnesium Alloy Chassis Focus From 2m Replaceable Twist-Up Eye Cups With Position Stops Stay-On Lens Covers Nitrogen purged. Waterproof. Fog proof. Hawke No-Fault Lifetime Warranty.