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Nikon ProStaff 20-60x82 3.2"/82mm Waterproof & Fogproof Spotting Scope (Angled Viewing) with 20-60x Zoom Eyepiece and Vue-Thru Case

Magnification: 20x-60x Objective Diameter (mm): 82 Angular Field of view (Real): 1.9@20x Angular Field of view (Apparent): 38.4@20x FOV @ 1000yds (ft.): 99@20x Close Focus Distance (ft.): 20 Exit Pupil (mm): 4.1@20x Relative Brightness: 16.8@20x Eye Relief (mm): 15.2@20x Size (L&W) Inches (body only): 15.4x4.5 Size (L&W) MM (body only): 391x114