| 摘要 |
A zoom lens is disclosed which has a small movement amount of the movable focusing lens unit and is capable of maintaining the movement amount of the movable focusing lens unit constant, regardless of whether the focal-length changing optical system is inserted or detached. The zoom lens has favorable operability during manual zooming, is capable of performing autofocusing and achieves a high zoom ratio and compactness. The zoom lens includes a varying magnification lens unit which is movable; a focusing lens unit which is movable and is disposed on an image side with respect to the varying magnification lens unit; and a focal-length changing optical system which changes the focal length of the zoom lens.
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