Huskemaw optics blue diamond riflescope incorporates the ballistic compensating turret with the simple, yet powerful wind hold huntsmart reticle (u.S.Patent 8365455).Featuring patented rfbc turret system with huntsmart reticle glass etched second focal plane reticle protected between two layers of glass; fast-focus eyepiece; grooved and bedded lenses with proprietary adhesive for maximum recoil tolerance; truebc drop compensation; high-density lens coatings; titanium turret springs for unequalled tracking; adjustable zero index ring and adjustable parallax knob.Magnification: 4-16xObjective: 42mmField Of View: 24.40 - 6.30 ft @ 100 ydsEye Relief: 4"Tube Diameter: 30mmLength: 13.60"Weight: 21.40 ozReticle: HuntSmartProofs: Fog Proof/Shockproof/WaterproofOptic Coating: High Density