| 摘要 |
Provided is a zoom lens system includes, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, the second and fourth lens units move on an optical axis during zooming. The third lens unit includes, in order from the object side to the image side: a third A lens unit having a negative refractive power; and a third B lens unit having a positive refractive power, the third B lens unit including a positive lens and a negative lens being joined together. When curvature radii of surfaces of the cemented lens on the object side and the image side are R3A and R3B, respectively, the following condition is satisfied: 5<|(R3A+R3B)/(R3A−R3B)|<30.
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