The Sightron S-TAC3-16X42 features 3-16X magnification with and objective diameter of 42mm and tube diameter of 30mm. The fast foucs eyebell allows for quick and easy adjustments in the field. The precision adjustable target turret is in .25 MOA adjustments and is protected by rugged windage and elevation caps. A pop up style zoom ring lever allows for ease of use in cold weather climates. The Zact-7 Revcoat employs revolutionary lens coating technology featuring fully multi-coated precision ground glass. This rifle scope features ExacTrack windage and elevation adjustment system and is waterproof, shockproof, and nitrogen gas charged.