Nikons action ex extreme all terrain binoculars are designed to appeal to optics users who value tough construction and reliable optical performance under even the most extreme conditions nikon extreme binoculars feature an all metal chassis with lens fittings housed in a tough lightweight polycarbonate body shell the 12x50 ex is nitrogen filled and o ring sealed for total waterproof fogproof and shockproof performance in any environment the binocular bodies are ergonomically shaped tripo