| 摘要 |
An inexpensive, compact, high performance zoom lens which has excellent production adaptability is disclosed. The zoom lens has a front lens group of positive refractive power which includes a negative lens element having a concave aspheric surface on the object-side, and a positive lens element having a convex surface on the image-side. The rear lens group consists of a negative lens element. A stop is arranged between the negative lens element and the positive lens element in the front lens group, and the following conditional formulas (1)-(3) are satisfied:0.40<f2/fw<0.50(1)0.01<D2/fw<0.05(2)-0.20<R4/R3<0.0(3)where f2 is the focal distance of the positive lens element in the front lens group, fw is the focal distance of the zoom lens at the maximum wide-angle state, D2 is the distance between the acing surfaces of the negative lens element and the positive lens element in the front lens group, R3 is the radius of curvature of the object-side surface of the positive lens element in the front lens group, and R4 is the radius of curvature of the image-side surface of the positive lens element in the front lens group.
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