Choose your favourite external illumination here to achieve maximum flexibility and greatest possible ease of use in stereo microscopyThese professional illumination units provide a quality of light at a high, constant intensity at all times.With the polarisation ring illumination unit, you also have an excellent component which has been specially optimised for observing shiny surfacesNaturally, these external illumination units also fit your standard stereo microscope.Exception: The ring illumination units cannot be used in combination with the following ranges: OSE-1, OSF-4G, OZL-45R, OZC-5, OZG-4