AIRMAX 4-12×40 AMX 16 layer fully multi-coated optics for exceptional clarity Wide view optical system ideal for airguns Glass etched reticle to withstand high recoil Integrated adjustable objective for parallax adjustment 1 inch mono-tube chassis for superior strength ¼ MOA low profile no-snag fingertip turrets Fast focus eyebell and high torque zoom ring Threaded objective/ocular for optional accessories Chassis:1 Mono-tube Optical System:4-12× Objective:40mm Reticle:AMX Illumination:N / A Focus/Parallax:Adjustable Objective - 7m / 7.5yds to Infinity Field of View: m @100m / ft @100yds10 - 3.7m / 29.9 - 11ft Eye relief:89mm / 3.5 Length:322mm / 12.7 Weight:522g / 18.4oz Waterproof, Shockproof, Nitrogen purged. All calibre rated.