... Operation Microscope (ASOM-3A) 1.Binocular tube, for two men. 2.3 steps.6X,10X,16X. 3.With controlled pedal Operation Microscope ( ... -6D. Focus of second object lens 125mm Binocular tube High brightness 45° Binocular tube Magnification Manual 3-step changer, total magnification ... Field of view Φ34mm, Φ20mm, Φ13mm Coaxial assistant's binocular tube Manual 3-step changer, total magnification 6x, 10x, 16x ...