Machine Vision Lenses

Machine vision lenses determine how sharply and with how little distortion the object is projected onto the camera sensor. The correct lens is not selected by focal length alone, but based on field of view, working distance, sensor size, pixel size, aperture and the accuracy required by the inspection.

For general inspection tasks, a fixed focal length lens is often sufficient when distance and object size remain stable. For precise measurement, a telecentric lens may be required because perspective errors and magnification changes must be reduced. In line scan applications, the lens must also match the sensor width, resolution and product speed.

A higher camera resolution only provides more usable detail when the lens delivers enough optical resolution across the full image field. That is why machine vision lenses must always be matched to the camera, illumination, working distance and mechanical mounting.