The redesigned Diamondback HD spotting scopes have all the horsepower the long-distance hunter needs, and they excel in low light - right when you need it most. Vortex also streamlined the exterior for a sleeker, snag-free profile, building in a helical focus wheel. Features: HD Optical System Optimized with select glass elements to deliver exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness and light transmission. Fully Multi-Coated Increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Specifications: Magnification 16-48x Objective Lens Diameter 65 mm Linear Field of View 138-72 ft/1000 yds Angular Field of View 2.6-1.4 degrees Close Focus 16.4 feet Eye Relief 20.3-18.3 mm Exit Pupil 4.0-1.35 mm Length 14.25 inches Weight 49.8 oz