0.66X-5.1X Zoom Ratio1∶7.8 binocular trinocular head stereo microscope

Zoom objective：0.68X-4.7X Zoom Ratio1∶6.8 Zoom objective：0.66X-5.1X Zoom Ratio1∶7.8 Greenough optical system, built-in rotating shaft zoom system. No tilting Image in left &right light path in complete interpupillary distance, No dizziness feeling after long time observing. Stereo angle for left & right light path is 12°, stereoscopic effect, large viewing field, high zoom ration.