| 摘要 |
The invention is a low-power zoom lens system for a stereoscopic vision microscope characterized by an objective having four lens members, the first and the fourth lens members being fixedly mounted, and the second and third lens members being mounted between the first and fourth lens members for movement relative to each other. The pupil is positioned within the objective. The absolute magnifying power of the first lens member is less than 1.0 and that of the fourth lens member is greater than 1.5. Preferably, the ratio of the absolute focal length of the third to the second lens member is greater than 1.3.
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