| 摘要 |
A zoom lens includes, in this order from the object side to the image side thereof, a first lens group having positive refraction power, a second lens group having negative refraction power, a third lens group having positive refraction power, and a fourth lens group having positive refraction power. The zoom lens satisfying the formulas: 0.15<fw/f1<0.3; -0.6<f2/f3<-0.4; and 1<f4/fw<3, where fw represents the shortest effective focal length of the zoom lens, f1-f4 respectively represent the effective focal lengths of the first, second, third and fourth lens groups.
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