The Burris Fullfield IV 4-16x50mm IR E3 Reticle Riflescope is designed to reach out for shots at long range targets. The side parallax adjustment and focus provides a crisp view as close as 10 yards to you, and the rotary dial illumination with 11 settings helps make sure you can see your target no matter the brightness outside. The capped hunter knob keeps the elements at bay, and the 3.5-3.9 eye relief promotes extended viewing with comfort.