National Geographic 90-20000 NG binoculars, 8x magnification, 40mm objective lens, PORRO Prism Bak4 Paul prism system, high-density matting thread on the mirror, clear imaging, high color reproduction The whole is seamlessly connected, and the bracket can be connected. The flip-down eyecup design, 2a swivel eyecup, you do not need to take off the glasses when wearing glasses, the parallax adjustment knob can adjust the left and right parallax, making the vision of both eyes clearer.