Kowa's KR CoatingKowa's KR coating protects the lenses from dirt and other foreign residues that may affix to the lenses during normal use. Fingerprints or oil can easily be removed with the proper lens cleaning techniques.Phase-Coated Roof PrismThe Schmidt prism roof surface is phase corrected to ensure sharp images for the most outstanding image contrast.All-Surface Multi-CoatingThe all-surface multi-coated optical system provides a precise color definition for a brighter and sharper image.Waterproof and FogproofThe housing is waterproof to JIS Protection Class 7 and filled with dry nitrogen gas to prevent internal fogging to ensure image clarity.Twist-Up EyecupsTwist-up multi-step eyecups allow customization for easy viewing even when wearing eyeglasses.Specs:Magnification: 12xObjective Lens Effective Diameter: 50mmMinimum Focusing Distance: 18ft / 5.48mReal Field of View: 4.8Eye Relief: 15.5mmField of View at 1000 ft/yds: 276ftDimensions: 17.52cm x 13.2cm x 5.84cmWeight: 742.75gInterpupillary Distance: 58.5 ~ 72mm