Technical details exit pupil diameter: 5.8Field of view: 427 feet item dimensions: 7.5 X 9 x 4 inches item weight: 1.76 Pounds objective lens diameter: 40 mm sport type: bird watching,huntingspecifications⦁ 8x magnification⦁ 40-millimeter lens diameter ⦁ 12-foot close focusing distance ⦁ 1.76-Pound weight ⦁ 17-millimeter eye relief ⦁ 5.8-Millimeter exit pupil ⦁ 427-foot field of view at 1,000 yards⦁ lens coating: multi-coated⦁ prism system: porro ⦁ prism glass: bk-7⦁ material: metal and natural rubber⦁ color: green⦁ waterproof:noproduct description these gskyer 8×40 hd wide angle binoculars are perfect for those looking for extremely versatile, high quality, and economically priced optics. Versatile, and ideal for stadium sports, bird-watching, hunting, and many other outdoor applications. The binoculars deliver a slightly higher mid-range magnification in a compact design with 40mm objective. For those who wear eyeglasses, or sunglasses on bright days, clever twist-up eyecups protect your lenses from scratching.