The new MONARCH HG was built from the ground up to achieve class-ruling optical performance, unrivaled ruggedness and exceptional handling. From eyecups to objective lenses, the new patriarch of the flagship MONARCH family pushes binocular performance to higher levels through design, technology and 20 years of MONARCH ATB-building experience. its ED (Extra-low Dispersion) glass and high-quality multilayer coating that is applied to all lenses and prisms for brighter, higher resolution viewing. High-quality multilayer coating is applied to all lenses and prisms, while dielectric high-reflective multilayer coating is applied to the roof prisms, achieving a bright view of up to 92% or higher light transmittance, and natural color fidelity Phase-correction prism coating enhances resolution and contrast Lead-and-arsenic-free glass used in all lenses and prisms Magnesium alloy body is lightweight and extremely durable Wider Available Interpupillary Distance Adjustment designed to fit virtually everyone?56mm-74mm Locking diopter control maintains your personal setting Long eye relief and turn-and-slide eyecups facilitate optimum eye position Closer minimum focus distance?just 6.6 feet