Discovery ED 4-16x50 SF optical sight Hunting Rifle Scope

Discovery ED 4-16x50 SF optical sight Hunting Rifle Scope collimator sight extremely low chromatic dispersion First Focal Plane Brand Name: DiscoveryModel Number: 4-16X50SFType: RifleFunction: LensMagnification: 4X-16XReticle Focal Plane: First focal planeExit pupil: 3.13mm- 10mmExit pupil distance(mm)(Eye relief): 100mm-85mmClick Value: 1/10MILEffective objective lens diameter(mm): 50mmTube diameter(mm): 30mmIlluminated: NOLength(mm): 312mmWeight(g): 625gAdjust Focus: Side Parallax (10yds~oo)Shock-Proof: 1500GSWater-Proof: 10MinFog-Proof: YESNitrogen Filled: YES