So far; so good. Vortex Kaibab HD Binoculars take long-range to a whole new meaning. The Kaibab HD features the apochromatic optical system, HD extra-low dispersion glass, XRPlus fully multi-coated lenses, dielectric prism coatings, plasma tech cutting, phase correction, roof prism, o-ring seal, argon gas purging, ArmorTek scratch-resistant coating, rubber armor, multi-position eyecups, center focus wheel, locking diopter, and tripod adapter compatible.