The USO TS-20X riflescope is built to meet the rigorous demands of long-range hunters and precision competitors. Whether you are gearing up your production class PRS Rifle or custom building your precision hunting rig, the TS-20X will help you maximize your rifles performance capabilities. Its wide range magnification and parallax adjustment allows you to dial down to 2.5 power for up close shots, and dial up to 20 power when you need to reach out past 1"000 yds. Its top tier optical system, ED (Extra-Low Dispersion) Glass, rugged 34mm aluminum body, and ample amounts of elevation and windage travel will ensure that you are more than ready for your next endeavor.Features :Magnification: 2.5 - 20xDiopter: +2/-3Exit Pupil Diameter: 2.5mm @ 20X20mm @ 2.5XParallax Adjustment: 10 yds - Infinity20X Field of View @ 100 meters = 2.2 meters12X Field of View @ 100 meters = 3.8 meters3X Field of View @ 100 meters = 11.3 meters2.5X Field of View @ 100 meters = 14 meters