| 摘要 |
A zoom lens system of the present invention has a plurality of lens units each composed of at least one lens element and, in order from the object side to the image side, comprises: a first lens unit having negative optical power and composed of two lens elements; a second lens unit having positive optical power; and a third lens unit having positive optical power, wherein in zooming, the lens units are moved such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein the condition is satisfied: 0.50<fL2/fT<1.00 where, Z=fT/fW>4.0, ωW>35, fL2: a focal length of the second lens element, fT, fW: focal lengths of the entire system at a telephoto limit, a wide-angle limit, ωW: a half value of the maximum view angle at a wide-angle limit.
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