The optical lens is an indispensable component in the machine vision system, which directly affects the quality of the image and the realization and effect of the algorithm. Optical lenses can be divided into short-focus lenses, medium-focus lenses, and telephoto lenses from the focal length; from the field of view, there are wide-angle, standard, and telephoto lenses; in terms of structure, there are fixed-aperture fixed-focus lenses, manual-aperture fixed-focus lenses, Automatic iris fixed focus lens, manual zoom lens, automatic zoom lens, automatic iris electric zoom lens, electric three-variable (iris, focal length, focus are variable) lens, etc