Levenhuk Rainbow 8x25 Amethyst Waterproof Fogproof Binoculars Roof prism Magnification: 8x Objective lens diameter: 25 mm Stylish. Keen. Refined. Comes in a kit - see the description Levenhuk Rainbow 8x25 Amethyst Binoculars Strap Cleaning wipe Pouch User manual Field of view, : 7.6 Field of view, yds/1000 ft: 399 Close focus, ft: 16 Eyepiece diopter adjustment, diopters: 5 Interpupillary distance (IPD), mm: 4076 Focusing: central Eyecups: twist-up Dimensions, in: 3.9x2.6x1.8 Weight, lbs: 0.62 Magnification, x: 8 Type: Roof prism Eyepieces: 7 elements in 3 groups Optics material: BaK-4 glass Optics coating: multi-coated Objective lens diameter (aperture), mm: 25 Exit pupil diameter, mm: 3.1 Eye relief, mm: 10.1 Twilight factor: 14.1 Relative brightness: 9.8