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. Features: 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