| 摘要 |
A zoom lens system having high zoom ratio capable of shifting an image for vibration reduction correction. The system includes, in order from an object, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, and a fourth lens group having positive power. Each of the first lens group through the fourth lens group moves such that when zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, a distance between the second and the third lens groups decreases, and a distance between the third and the fourth lens group decreases. The third lens group includes at least two sub-lens groups having positive refractive power. Image shifting carried out by moving either of the two sub-lens groups perpendicularly to the optical axis. Given conditions are satisfied.
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