BIAL 20x50 Binoculars Portable Water Resistant Telescope Super High-Powered Surveillance Binoculars central focus fast and accurate Support the use of a tripod and lanyard hole design High quality BAK4 porro prism ruby coated to minimize UV glare,50mm large aperture, can clear view in darker. Focus: Center the handwheel adjustment and right eyepiece parallax adjustable Large eyepiece, view of comfortable See long eyes not tired Objective green plated film clarity is pretty good,Red membrane high-definition