| 摘要 |
Provided is a zoom lens including four lens groups having refracting powers of negative, positive, negative and positive, respectively, arranged in the mentioned order from the objective side of the zoom lens, wherein, upon zooming from a short forcal length to a long forcal length, a first lens group moves at first toward the image side and then is reversed to move toward the objective side, while second, third and fourth lens groups all monotonously move toward the objective side.
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