| 摘要 |
A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group.Zooming is performed by moving each of the positive first through the negative fourth lens groups along the optical axis.The zoom lens system satisfies the following condition:whereinf23T designates the combined focal length of the negative second lens and the positive third lens groups at the long focal length extremity;f23W designates the combined focal length of the negative second lens and the positive third lens groups at the short focal length extremity;fT designates the focal length of the entire the zoom lens system at the long focal length extremity; andfW designates the focal length of the entire the zoom lens system at the short focal length extremity.
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