| 摘要 |
A zoom lens system includes from one side to the other side: a first lens unit of a negative power having a negative lens element concave to the one side; a second lens unit of a positive power having a positive meniscus lens element convex to the one side, a biconcave lens element whose one side surface has a larger radius of curvature and a biconvex lens element; and a third lens unit of a negative power having a negative meniscus lens element concave to the other side. In order to perform zooming, the distance between the first lens unit and the second lens unit and the distance between the second lens unit and the third lens unit are varied, and the entire zoom lens system is moved along the optical axis.
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