The FA lens provided by LBTEK is optimized for machine vision light sources and chips, with high resolution, excellent imaging quality, high transmittance and good stability. Compared with fixed focal length lenses, zoom lenses can change the field of view by changing the focal length, and have more flexible imaging capabilities. In industrial inspection, they can replace multiple ffixed focal length lenses, thereby simplifying the inspection system. Therefore, they can be widely used in machine vision and industrial automation fields such as: workpiece inner hole defect detection, core inner wall defect recognition, label character detection, etc.