| 摘要 |
A zoom lens including a second, third and fourth lens groups (12, 13 and 14) wherein at least one surfaces of the first to fourth lens groups has an aspherical surface, wherein the following relations are satisfied:where f1 is a composed focal length of the first lens group, f2 is a composed focal length of the second lens group, f3 is a composed focal length of the third lens group, f4 is a composed focal length of the fourth lens group, and fw is a composed focal length of the entire system at a wide-angle end. Thereby, a compact zoom lens having an excellent aberration performance and a high zoom ratio of 20 times or more can be realized.
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