Optical design of high-magnification zoom stereo microscope objective

In order to achieve high-magnification in continuous zoom stereo microscope objective system and avoid using aspherical optics and diffractive elements, new methods of zoom compensation were adopted in zoom lens designing with double linkage moving lens groups. By choosing 6 zoom positions for designing and calculation, the zoom of 0.8~16(20∶1) stereo microscope objective system was achieved. The working distance of the system reached 91 mm, and the back focal length reached 200 mm. After analyzing modulation transfer function (MTF) and aberration of the optical system, the results show that this zoom stereo microscope objective system realizes high magnification and high imaging quality.