| 摘要 |
A small-sized zoom lens in which the displacement of the focusing lens unit does not increase to an excessive degree during focusing, the zoom lens including a first lens unit of positive refractive power; a second lens unit of negative refractive power; and a subsequent lens unit of positive refractive power in that order from the object side, wherein focusing is effected by a subunit 2b of negative refractive power constituting a part of the second lens unit and wherein, assuming that the magnification of the subunit 2b at the wide-angle end is beta 2bw, the following condition is satisfied: 0< beta 2bw<1.
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