All Frontier models feature Hawke"s H7 optics, offering stunning high definition viewing with incredible color control and phase correction. High performance lens coatings and Dielectric Coated prisms ensure the highest level of light transmission. ED X models benefit from Extra-low Dispersion glass for controlled chromatic aberration and the elimination of color fringing.Extra-Low Dispersion (ED) GlassDielectric CoatingsHigh Resolution Phase Corrected BAK-4 Roof PrismsWater Repellent Lens CoatingsMagnesium Alloy ChassisFocus From 3mReplaceable Twist-Up Eye Cups With Position StopsStay-On Lens CoversNotice: DEMO products may not include all accessories.