| 摘要 |
An optical zoom lens includes, in this order from the object side to the image side thereof, a first lens group of negative refraction power, a second lens group of positive refraction power, and a third lens group of positive refraction power. The optical zoom lens satisfies the formulas of: -0.45 <Fw/f1<-0.3; and 0.4<f2/|f1|<0.8, where Fw is the smallest effective focal length of the optical zoom lens, f1 is the effective focal length of the first lens group, and f2 is the effective focal length of the second lens group.
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