With a lens suitable for the respective image evaluation task, the size of the image field is determined for the camera image for the required operating distance.

High light intensity and the geometry of the image are extremely important for image evaluation (code reading, form recognition and position detection) High light intensity permits short shutter speeds and consequently a reduction of the blurring due to motion as well as maximizing the range.

Lenses with fixed focal length and a settable aperture and focus are ideal for this purpose and are therefore preferred.