| 摘要 |
A high performance zoom lens system is provided capable of driving a vibration reduction lens group while securing sufficient brightness (small F-number) and sufficient back focal length. The zoom lens system includes a first lens group G1 of positive refractive power, a second lens group G2 of negative refractive power and a last lens group GL of positive refractive power. An interval between the first lens group G1 and the second lens group G2 increases and an interval between the second lens group G2 and the last lens group varies during zooming from a maximum wide-angle state to a maximum telephoto state. The last lens group GL includes a first lens subgroup GL1 of positive refractive power, a second lens subgroup GL2 of positive refractive power and a third lens subgroup GL3 of either positive or negative refractive power. A displacement device prevents vibration by moving the second lens subgroup GL2 in a direction substantially perpendicular to the optical axis.
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