| 摘要 |
<p>A zoom lens of the rear focus type is disclosed, comprising, from front to rear, a first lens group of positive power, a second lens group of negative power, a third lens group of positive power and a fourth lens group of positive power, wherein zooming from the wide-angle end to the telephoto end is performed by axially moving the first, second and fourth lens groups in differential relation to one another, and focusing is performed by axially moving the fourth lens group alone.</p> |
