| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compact, high-performance zoom lens having a compact focusing group that performs focusing with little displacement in the focusing, having a high-speed AF function and a wide field angle, and suited to digital still cameras. <P>SOLUTION: The zoom lens comprises: in order from an object side to an image side, a positive first lens group I; a negative second lens group II; a negative third lens group III; a positive fourth lens group IV; and a positive fifth lens group V; and an aperture S disposed between the third lens group and the fourth lens group. When varying a power from a wide angle end to a telephoto end, the first lens group moves towards the object side, an interval between the first lens group and the second lens group is increased, an interval between the second lens group and the third lens group is increased, an interval between the third lens group and the fourth lens group is decreased, and an interval between the fourth lens group and the fifth lens group is decreased. The third lens group comprises a single negative lens. The zoom lens is configured to perform focusing by displacement of the third lens group, and satisfies conditions (1)-(3). <P>COPYRIGHT: (C)2012,JPO&INPIT |
