ZOOM LENS SYSTEM, IMAGE PICKING-UP DEVICE AND CAMERA

摘要

A zoom lens system has a plurality of lens groups comprised of one or more lens elements, wherein a first lens group is provided with two of the lens elements with negative power in order from the object side to the image side, a second lens group is provided with positive power, a third lens group is provided with positive power, the lens groups are moved to vary magnifications at the zooming operation so that an interval between the first and second lens groups reduces while an interval between the second and third lens groups increases and satisfy the following conditions: 2.50W) x Z) T/fW >4.0, ?W>35, fT and fW: focal distances of all the systems at the telescopic and wide angle edges, respectively, and ?W: a half value of the maximum image angle at the wide angle edge).