Named after the King of all the Greek Titans, the Cronus 15x56 UHD binoculars are designed for heavy duty use in any condition. The Cronus was built with Athlons own E2ES lens system which provides a flat field of view with sharp, brilliant images. The image quality is enhanced even further with Athlons cutting edge Enhanced Spectral Prism (ESP) dielectric coating, which reflects 99% of the light to the users eyes for a bright picture with accurate color reproduction. In addition, the Cronus was designed with a magnesium chassis, which provides the strength of a metal chassis while reducing the weight by 35%. Features of the Cronus 15x56 UHD binoculars: E2ES field flattening system ED GlassESP Dielectric Coating Lightweight Magnesium ChassisXPL Coating for dirt, scratch and oil protectionPhase Corrected PrismsABBE PrismsAdvanced Fully Multi-Coated LensesLong Eye Relief (18.5mm) Close focus Twist up EyecupsWaterproof Argon Purging Athlon Cronus 15x56mm UHD Green Binoculars w/Hard Case 111003