Vortex Diamondback HD 15x56 Binoculars 15x magnification 56mm objective lenses HD optical system .61" (15.6mm) eye relief Linear field of view: 230' @ 1000 yards Angular field of view: 4.4 Close focus distance: 14' Interpupillary adjustment range: 2.32"-2.99" (59mm-76mm) Adjustable diopter Twist-up eyecups Center focus wheel ArmorTek lens coatings Dielectric prism coatings Phase correction Fully-multicoated lenses Roof prism system Rubber Armor texturized grip and protective armor Waterproof, fogproof, shockproof O-ring sealed and argon purged Length: 7.1" Width: 5.8" Weight: 34.8oz Includes lens cloth, comfort neck strap, Rainguard eyepiece lens cover, tethered objective lens covers, GlassPak binocular harness and case, tripod adapter VIP Warranty, unlimited, lifetime, transferable