| 摘要 |
<p>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, at least the first and second lens groups move at the zooming operation, an aperture stop is arranged to move together with the second lens group as unity on the optical axis at the zooming operation on the image side of the second lens group, the second lens group moves in the vertical direction with respect to the optical axis and satisfies the following conditions: 1.002W) x m3WT/fW >4.0, ?W>35, m2W and m3W: lateral magnifications of the second and third lens groups at a wide angle edge in an infinite distance condition, respectively, fT and fW: focal distances of all the systems at the telescopic and wide angles edge, respectively, and ?W: a half value of the maximum image angle at the wide angle edge).</p> |
