Feature First Focal Plane Spotting Scope w/ Ranging Reticle. 80mm Objective Lens. ED Glass, Extra-low Dispersion, Superior Clarity Resolution. Fully-multi Coated. IP67 Water Resistant. Heavy-duty Magnesium-alloy Die Casting. Rubber Armed to Protect against Crashes and Scratches. Specification Magnification: 20-60x Body Style: Magnesium-alloy die casting Objective Lens Dia.: 80mm / 3.15in Ocular Lens Dia.: 40mm / 1.57in Overall Length: 390mm / 15.35in Weight: 2227 g / 78.56 oz Field angle: 2.3Adeg~0.8Adeg Field of view: 12.0-4.2ft @ 100yds Field of view: 4.0-1.4m @ 100m Exit Pupil Dia.: 4.0-1.3mm Near Focus: 10m Eye-Relief: 30mm Relative Brightness: 16~1.69 Optical Material: All Lens and Prism are made of Optical Glass Coating: Fully Multi Coated Surface Treatment: Rubber and Paint Resolving Power: 3.5" Focusing System: Internal Focus Diopter Adjustable Water Resistant: IP67 Environmental: Fill nitrogen, waterproof and fogproof. Eyecups: Twist up Accessory: Softbag, manual, and lens cleaning cloth. Video Reticle Product Manual