The 4-16x44 VI Series Riflescope from Vixen Optics is a versatile zoom riflescope effective for most shooting conditions. This model of the VI Series features a left-side focuser opposite the windage turret. The nitrogen-purged and o-ring sealed optical tube assembly is water and fog proof. All of the optical surfaces are fully multicoated to limit reflection and enhance light transmission.The duplex crosshair reticle is focused using the dioptric adjustment at the rear of the scope. Shot-corrections of ¼ per click are made by hand without tools. The windage and elevation turrets are protected by screw-down caps. The scope has see-through lens caps to protect the lenses, but still allows you take a shot without removing them.Optical Performance4-16x zoom magnification44 mm objective lensFully multicoated optics3.7 to 3.5" eye relief11 to 2.8mm exit pupil28.2 to 2.2' at 100 ydDuplex-style cross-hair reticleUse and Handling¼ MOA per click impact correction18 MOA Maximum windage and elevation adjustmentDiopter adjustment to focus the reticleConstructionImpact and shock resistant housingWater and fog proof, nitrogen-purged and o-ring sealedMain tube is a single piece of aluminum for strength and durabilityIn the BoxVixen Optics 4-16x44 VI Series Riflescope with Side FocusSee-Through Lens CapsLimited Lifetime WarrantySpecifications for Vixen 5850 Objective Lens Diameter: 44 mm Magnification: 4 - 16 x Reticle: Duplex w/ Illuminated Red Center Dot Reticle Tube Diameter: 1 in Reticle Focal Plane: Second Focal Plane (SFP) Exit Pupil: 2.75 - 11 mm Field of View, Linear: 7.2 - 28.5 ft at 100 yds Eye Relief: 3.7 in Color: Black Weight: 14.6 oz Fabric/Material: Aviation grade aluminum, Aircraft Grade Aluminum Length: 12.4 in Illumination Type: Non-Illuminated Adjustment Type: MOA Adjustment Click Value: 0.25 MOA Parallax: 100 yds Lens Material: Glass Weather Resistance: Yes Water Resistance Level: IP67 Shockproof: Yes Fogproof: Yes Finish: Matte Package Type: Gift Box Magnification Type: Variable W/E Travel at 100 Yds:36 MOASpecifications for Vixen 5941 Specification: 4-16x44 Magnification: Low Power 4X; High Power 16X Object Effective Aperture: 44mm Exit Pupil: 2.75mm Brightness: 7.65 Twilight Factor: 26.53 Real Field of View: Low Power 4.75°; High Power 1.18° Resolution: Low Power 6"; High Power 4" Image Deviation by Zooming: Diopter Deviation by Zooming: +/-0.3M Diopter Adjustment Range: +/-1M Parallax Adjustment Position: 100 Yds. Focal Scope Parallax: +/-0.3M Reticle Tilt: 1.50 Objective Point Correction Range: +/-18' Eye Relief: 90mm Lens Coating: Full Multi-Coating Lens Composition: 7 Group 11 Element Body:One PieceSpecifications for Vixen 82021 Objective Lens Diameter: 44 mm Magnification: 4 - 16 x Reticle: BDC Glass Etched Reticle Tube Diameter: 1 in Reticle Focal Plane: Second Focal Plane (SFP) Exit Pupil: 2.75 - 11 mm Field of View, Linear: 2.2 - 28.2 ft at 100 yds Eye Relief: 3.7 in Color: Black Weight: 14.6 oz Fabric/Material: Aviation grade aluminum, Aircraft Grade Aluminum Length: 11.8 in Illumination Type: Non-Illuminated Adjustment Type: MOA Adjustment Click Value: 0.25 MOA Parallax: 100 yds Lens Material: Glass Weather Resistance: Yes Water Resistance Level: IP67 Shockproof: Yes Fogproof: Yes Finish: Matte Package Type: Gift Box Magnification Type: Variable W/E Travel at 100 Yds:36 MOA