The Sightron SIII 8-32x56mm Long Range Illuminated MOA-2 Rifle Scope features a 30mm tube for added strength and better light transmission. Each Sightron SIII is nitrogen filled to prevent fogging and is also water, fog and shockproof. Other features include easy to adjust target style turrets, side parallax adjustment, and a fast focus eyepiece. Sightron’s SIIISS832x56LR series riflescopes reach beyond the boundaries of precision shooting. Side Focus Parallax adjustment aimed for quick and easy adjustment and will focus from minimum focusing distance to infinity.