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: 0.35<(f23T/f23W)/(fT/fW)<0.55 (1) wherein f23T 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; and fW designates the focal length of the entire the zoom lens system at the short focal length extremity.
|