| 摘要 |
A zoom lens system has, from the object side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The first, second, and fourth lens units are moved during zooming. The third lens unit is fixed during zooming. The following conditions are fulfilled: -5.0<M1 Ymax<-1.0 -1.0<M4 M2 <-0.1 where M1 represents the displacement amount of the first lens unit from the shortest focal length condition to the longest focal length condition; M2 represents the displacement amount of the second lens unit from the shortest focal length condition to the longest focal length condition; M4 represents the displacement amount of the fourth lens unit from the shortest focal length condition to the longest focal length condition; and Ymax represents the maximum image height.
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