WestHunter HD 4-16x44 FFP Specifications: Magnification Low:4 Magnification High:16 Tube Diameter:1.18in / 30mm Objective diameter:44 Diopter range +/-:2 Exit Pupil Distance (mm):96 Click Value:1/10MIL Total travel elevation (@ 100 yds):≥ 45MOA Total travel windage (@ 100 yds):≥ 45MOA Parallax Compensation:15yds-∞ Fast focus eyepiece:yes Sealing gas used:Nitrogen Clear aperture min magnification (mm):44 Clear aperture max magnification (mm):44 Eff. exit pupil diameter @ min. magnification ± 3 %:11.00 Eff. exit pupil diameter @ max. magnification ± 3 %:2.75 Maximum resolution in Arc. Second (min. Magnification):4 Maximum resolution in Arc. Second (max. Magnification):4 Range of Function temperature (Unit can still be operated):-25°C/+55°C Storage temperature:-40C to +85C Range of Dioptric compensation +/- dpt:2 Permissible backlash Dioptric Compensation:<0.25dpt objective field of view @ min magnification (ft @100yds):27.3 objective field of view @ max magnification (ft@100yds):6.8 Change of impact point after change of magnification (MOA):1 Straightening of the Reticle:± 2 ° Coating:FMC Optical length at infinity and zero diopter (mm):313 Length:12.52in / 31.8cm Weight(g):20.46oz / 580g