VANTAGE 4-12×50 AO MIL DOT IR 11 layer fully multi-coated optics for excellent clarity Adjustable objective for parallax correction (AO models) 1 inch mono-tube chassis for superior strength Glass etched reticle with red and green illumination Rheostat on saddle offers 5 levels of brightness ¼ MOA low profile no-snag fingertip turrets Fast focus eyebell and high torque zoom ring Chassis:1" Mono-tube Optical System:4-12× Objective:50mm Reticle:Mil Dot Center Illumination:Red / Green - 5 Levels Focus/Parallax:Adjustable Objective - 9m / 10yds to Infinity Field of View: m @100m / ft @100yds8.7 - 2.9m / 26.2 - 8.7ft Eye relief:89mm / 3.5 Length:349mm / 13.7 Weight:600g / 21.2oz Waterproof, Shockproof, Nitrogen purged. All calibre rated.