| 摘要 |
A zoom lens in the present invention is composed of a first lens group G1 having a fixed distance from the image plane side and negative refracting power, a second lens group G2 having positive refracting power and moving during zooming, a third lens group G3 having positive refracting power and moving during zooming, and a fourth lens group G4 having a fixed distance from the image plane side and positive refracting power. The first, the second, the third and the fourth lens groups G1-G4 are arranged in order from the object side to the image plane side. The third lens group G3 includes an aperture stop s, a lens 13 having positive refracting power and a lens 14 having negative refracting power, being arranged in order from the object side to the image plane side. The zoom lens is high performance and large in zoom ratio and is compact due to the simple structure.
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