| 摘要 |
A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, the positive third lens group remains stationary, and the negative first and positive second lens groups move along the optical axis of the zoom lens system. The negative first lens group includes at least one positive lens element which has a convex aspherical surface facing toward the image. Furthermore, the following conditions (1) and (2) are satisfied:whereinf1, f2 and f3 designate the focal length of the first, second and third lens groups, respectively.
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