The Viper HS’s advanced optical system, highlighted with a 4X zoom range, ensures magnification versatility. A forgiving eyebox with increased eye relief gets you on target quickly and easily. Built on an ultrastrong 30mm one-piece machined-aluminum tube, the Viper HS delivers increased windage and elevation travel for optimal adjustment. Extra-low dispersion XD glass maximizes resolution and color fidelity, resulting in crisp, sharp images. Vortex proprietary XR fully multicoated lens coatings increase light transmission for the brightness you need in low-light conditions. ArmorTek ultrahard, scratch-resistant coating protects exterior lenses from scratches, oil and dirt. Waterproof, fogproof and shockproof construction. Backed by Vortex’s VIP unlimited lifetime warranty. 30mm main tube.