Vortex Optics Razor HD 5-20x50 First Focal Plane Riflescopes The Razor HD 5-20x50 riflescope is built to handle the needs of precision and tactical shooters facing the most extreme, long-range shooting situations. High density, extra-low dispersion glass and premium XR coatings generate unparalled image quality and brightness. Index-matched apochromatic lenses correct color across the entire visual spectrum. The glass-etched, first focal plane reticle is incredibly versatile and ensures subtensions remain accurate throughout the entire zoom range. Shooters can choose between 11 levels of brightness. A side focus provides optimal image focusing and parallax removal. The fast focus eyepiece allows quick and easy reticle focusing. Rapid Zero Return feature stops the turret from dialing below sight in range using rugged steel components. A single piece 35mm tube was precision machined and anodized to give you a rock solid platform. It's waterproof, fogproof, and has Armortek coatings to protect the lenses from scratches, oil, and dirt.