Vector Optics Rifle Scope 10-40X50 Adjustable Objective With Illuminated Range Finding Reticle. 25.4mm One Inch Tube, Direct Turret Adjustment, Green & Red Illumination, Min Focus 10 Yds, Range Finder Reticle, Objective lens focus: Min focus at 10 yards, 10, 15, 20, 30, 50, 100 ,200 and infinite (available image distance from 10 to 450 yards) 5 levels green and red brightness illumination system 25.4mm one inch tube Shock proof (750g), Water Proof and Fog Proof (Nitrogen Purged) High quality aluminum alloy in durable black matte finish Feature 1/4 M.O.A direct high finger windage and elevation turrets adjustments Fast focus eyepiece at ocular lens adjustment (diopter compensation) Magnification 10-40x Objective Lens Dia 50mm Ocular Lens Dia 36mm Ocular Length 65mm (2.6 inch) Exit Pupil 5.00-1.25 mm Length 420mm (16.5 inch) Weight (net) 665g (23.4 ounce) Eye Relief 90-80mm (3.5-3.1 Inch) Field of View (@100yds): 0.4-1.6° Optics Coating Multi Coated Reticle Rangefinding R14 Wire Evaluation Range ± 40 MOA Windage Range ± 40 MOA Battery CR2032