| 摘要 |
<p>A zoom lens includes a first lens unit of a negative optical power, a second lens unit of a positive optical power and a third lens unit of a positive optical power. The second lens unit consists of a first lens sub unit of a positive optical power arranged on an object side and a second lens sub unit of a positive optical power arranged on an image side with respect to a maximum gap in the unit. The first through third lens units are arranged in that order from the object side to the image side. Zooming is effected by moving the lens units such that the distance between the first lens unit and the second lens unit is smaller at a telephoto end than at a wide-angle end and that the distance between the second lens unit and the third lens unit is larger at the telephoto end than at the wide-angle end. Focusing is effected by moving the second lens sub unit or the third lens unit. When focusing is effected on an object at infinity at the wide-angle end, the distance between the first lens sub unit and the second lens sub unit and the focal length of the entire system at the wide-angle end are set to satisfy a predetermined condition. <IMAGE> <IMAGE> <IMAGE></p> |
