APO System – Triplet Apochromatic lens combines with HD glass to provide unmatched color sharpness; HD Lens Elements – Premium HD (High Density) extra-low dispersion glass delivers the ultimate in resolution and color fidelity, resulting in High Definition images; XR Plus Fully Multi-Coated – Premium proprietary coatings deliver the highest level of light transmission with multiple anti-reflective coatings on all air-to-glass surfaces for maximum brightness; Dielectric Prism Coatings – Multi-layer prism coatings provide bright, clear, color-accurate images; Plasma Tech – Cutting edge application process provides unparalleled coating durability and performance; Porro Prism – Offers maximum image quality and performance in a traditional design; Angled Body Design – Valued for allowing an overall lower mounting height which maximizes stability in wind, offers greater comfort when glassing for extended periods, and permits the use of a smaller, lighter tripod; Waterproof – O-ring seals prevent moisture, dust and debris from penetrating the spotting scope for reliable performance in all environments; Fogproof – Argon gas purging prevents internal fogging over a wide range of temperatures; ArmorTek – Ultra-hard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt