Compact, rugged, waterproof, fogproof. Nitrogen filled and O-ring sealed. Long eye relief for eyeglass wearers. Rubber armored, polycarbonate body. Eco-glass lenses and prisms. Aspherical eyepiece lenses for crisp, distortion-free viewing. 8 x 25: Magnification: 8x, Objective Diameter: 25 mm, Angular FOV: 6.3° (real), 47.5° (apparent), FOV @ 1000 yds: 330', Close Focus Distance: 9.2', Exit Pupil: 3.1 mm, Eye Relief: 15.5 mm, Size: 3.9" x 4.5", Weight: 12.5 oz.|10 x 25: Magnification: 10x, Objective Diameter: 25 mm, Angular FOV: 5° (real), 47.2° (apparent), FOV @ 1000 yds: 262', Close Focus Distance: 9.2', Exit Pupil: 2.5 mm, Eye Relief: 15.9 mm, Size: 4" x 4.5", Weight: 12.9 oz.