The patented Werth Zoom Optic is a flexible solution that can handle any measurement task. It allows “CNC capable” adjustment of not only the magnification, but also the working distance between the lens and the measurement object, over a range of 20 mm to 200 mm. One advantage of the very large working distance is the ability to check deep blind holes and large diameter turned parts without collisions. Another advantage of this flexible working distance is seen when it is combined with the Werth MultiRing (patent) for changing the angle of illumination. This allows object edges to be distinguished that would never be visible with classical illumination methods.