SW20X80 binoculars

Magnification:20XObjective diameter(mm)80Front lens diameter101Prism (BAK4 / BK7)BK7Prism Type (Roof / Porro)PorroEyepiece diameter(mm)17-23Exit pupil diameter(mm)7Relative Brightness Index (RBI)49Field of view(ft /1000 yds)6.5Eye relief(mm)17Close distance(M)6Waterproof (Y/N)NOFogproof(Y/N)NOTwilight number40Diopter adjustment:-4D +4DNet weight(g)2377Dimensions of product230X100X330AccessoriesYesCleaning ClothYesShoulder StrapYesSiliconYesInstruction SheetYesBurglary Alarm TagNoGiftbox PackingYesAluminium Case PackingNoMaster CartonYesInner CartonNo Product Feature:1. Nitrogen-filled, perfect sealing performance, effectively waterproof, fogproof. Can be used in different weathers. also with floating function -- consistantly work 20mins under water. No anxiety of falling into water2. Aluminum alloy metal body, light weight, stable, and durable. Confirtable high strength rubber armour3. High magnification (20x). Large objective lens dia. (80cm) and long eye relief design4. Professional 100% optical lens, fully multi-coated and bak4 prism glass brings you a clear, nice image through the binocular5. with steeltripod supoort, convenient to use together with tripod, and steadyProduct material:aluminum alloy metal body, high strength rubber armoured100% optical lens, bak4 prism, multi-coated