Using fewer cameras to photograph every surface of an object is now a common demand in the machine vision market. While traditional flat field of view or“Pinhole lens” can not directly capture the characteristics of the vertical inner wall surface, for this pain point COOLENS introduced: 360 ° inner wall detection lens, the inner hole inspection lens is specially designed for photographing the bottom of the inner hole and its vertical inner wall. Through a single shot, the inner wall of the measured object can be completely displayed, effectively simplifying the layout of the visual system, reducing the cost and improving the detection efficiency.