| 摘要 |
A zoom lens includes a first to fourth lens unit. Zooming is performed by moving the lens units so that a spacing between the first and the second lens unit at a telephoto end is larger than the spacing between the first and the second lens unit at a wide-angle end, and so that the spacing between the third and the fourth lens unit at the telephoto end is smaller than the spacing between the third and the fourth lens unit at the wide-angle end. If focal lengths of the first and the fourth lens units are f1 and f4, and if the focal length of entire system at the wide-angle end and the focal length of the entire system at the telephoto end are fw and ft, conditions expressed by 0.2<F1/ft<0.5, -0.2<F4/ft<-0.05 and 3.7<ft/fw<6.0 are satisfied.
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