| 摘要 |
In a short-focal-length side zooming range, a moveable sub-lens group of a zoom lens system is made stationary at one of the object-side and the image-side end. At the intermediate switching focal length, the moveable sub-lens group is moved to the other of the object-side and the image-side end. In a long-focal-length side zooming range, the moveable sub-lens group is made stationary at the other end, and the zoom lens system satisfies the following condition:whereinmNt designates the transverse magnification of the most image-plane side lens group of the zoom lens system when the moveable sub-lens group is at one end; andmNw designates the transverse magnification of the most image-plane side lens group of the zoom lens system when the moveable sub-lens group is at the other end
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