Nightforce Benchrest Rifle Scopes have large, multi-coated lenses that provide the resolution necessary to distinguish fine detail at extremely long ranges. Other features include resettable target turrets, a diopter style eyepiece for fast focusing and an adjustable objective for fast parallax adjustment from 25 yards to infinity. The coil spring plunger return system maximizes tracking accuracy which is exceedingly important for the serious target shooter. Nightforce Benchrest Rifle Scopes are water, fog and shockproof. They are covered by a limited lifetime factory warranty.