With a comparison microscope two specimens may be observed at the same time: separated by a dividing line, by superposing two images, or by left field - right field correspondingly. The controler UFDM10B allows the adjustment of the image to the left or right, or to any position in between. The high quality of the optical system allows a color adjustment in the observed field of 20 or 22 mm. The modular design offers the possibility of using reflected or transmitted light. The comparison bridge may be used with Dark Field, Bright Field, Polarization, Phase Contrast, Epi-Fluorescence and other contrasting methods.