The Vixen VI Series 4-16x44 Riflescope with Side Focus 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 1/4 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.