Sightron scope s-tac 4-20x50 duplex target knobs 30mm sf FEATURES:Magnification:4-20XObjective Diameter (mm):50Focal Plane:Second Focal PlaneFov (ft@100 Yds.):23.6-4.4Eye Relief (in.):3.7-4.0Reticle Type:DuplexClick Value (@100 Yds.):1/4 MOAMinutes Per Revolution:15 MOAW/E Travel (@100 Yds.):40/80MOAKnob Style:Target(Resettable)Zero Stop:NoFocus Type:Side Focus Parallax Range:10yds to InfinityFinish:Matte BlackWaterproof:YesFully Multi Coated:Yes (Zact-7 TM 7-Layer)Weight (oz.):23.6Length (in.):14.8Tube Diameter:30mm Other Features: Hunting & target shooting, duplex reticle, target turrets with 1/4 moa adjustments and are resettable to zero,zoom ring lever