| 摘要 |
A zoom lens system according to the invention includes, in order from the front to the rear, a first lens unit having negative optical power, an aperture stop, a second lens unit having positive optical power, and a third lens unit having positive optical power, and the distance between the first lens unit and the second lens unit varies when zooming. The second lens unit consists of, in order from the front to the rear, a positive lens element and a negative lens element disposed at a distance therefrom. The distances between the second lens unit and the third lens unit at the short focal length end and at the long focal length end are set to suitable values. Consequently, a zoom lens system having a superior optical performance is achieved without increasing the number of lenses included therein.
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