"The Vortex Optics Razor HD Gen II 4.5-27x56 Riflescope with EBR-2C MOA Reticle combines a high-transmission lens system and weather-sealed 34mm main-tube to create a versatile optic for mid to long-range targeting. Vortex Optics uses an apochromatic objective lens and optically indexed Extra-low Dispersion (HD) glass elements to maximize the light gathering ability of the optics while minimizing chromatic aberration and preserving clarity. The resulting images are bright and sharp throughout the zoom range.This Razor HD scope is configured with a EBR-2C MOA reticle in the second focal plane (SFP). The EBR-2C MOA pattern is an illuminated duplex-style variant with medium-weight posts at three, six and nine o'clock that taper to a fine crosshair. Stadia lines on the horizontal and vertical crosshairs aid in ranging, calculating hold-over and ballistic-drop compensation. The reticle illumination is controlled using a click-stop wheel on the side focus turret. The illuminator has eleven brightness settings and an Off position between each setting allows the shooter to quickly return to their previously-used level of illumination without cycling through other settings.The scope main-tube is machined from a single piece of aluminum, anodized with a corrosion-resistant matte-black finish and filled with argon gas to ensure fogproof and waterproof performance. Exposed lens surfaces are protected with Vortex Optics's proprietary ArmorTek scratch-resistant coating that"