What is the widest angle of outdoor surveillance camera?

If you use a tripod head or a ball machine to rotate, it is about a 355-degree panorama; If it is only the maximum wide angle of the camera, it is 2 or 8 mm, about 89 or 9 degrees. The bigger the lens, the smaller the viewing angle.

Wide-angle lens is a photographic lens with shorter focal length, larger viewing angle, longer focal length and smaller viewing angle than standard lens. Wide-angle lenses are divided into ordinary wide-angle lenses and ultra-wide-angle lenses. Ordinary wide-angle lenses generally have a focal length of 38 to 24 mm and a viewing angle of 60 to 84 degrees; The ultra-wide-angle lens has a focal length of 20 to 13mm and a viewing angle of 94 to 1 18 degrees. Because the wide-angle lens has a short focal length and a large viewing angle, it can shoot a large area of scenery in a short shooting distance.