| 摘要 |
A zoom lens comprises, in order from the image end to the object end, a negative power first lens group, a positive power second lens group, a positive power third lens group and a positive power fourth lens group. The first, second and third lens groups are axially movable in predetermined relation relative to one another and relative to the fourth lens group which is stationary to focus and vary the focal length of the zoom lens. The zoom lens satisfies at least the following condition:1.6<D34w/Fw<2.8where D34w is the axial air distance the third and fourth lens groups of the zoom lens at the wide angle end position and Fw is the focal length of the overall zoom lens at the wide angle end position.
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