| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a telephoto zoom lens in which a focus lens group and a vibration-proof group are compact and light-weight and which has excellent imaging performance. <P>SOLUTION: There is provided a telephoto zoom lens which has at least a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having positive refractive power, and a fifth lens group having negative refractive power in the order starting from an object side. In focusing from an infinite distance to a close-distance object, the fourth lens group is moved in an optical axis direction. The fifth lens group has at least a 5A lens group having negative refractive power and a 5B lens group having positive refractive power in the order starting from an object side, and camera shake is corrected by moving the 5A lens group as a vibration-proof lens group in a direction perpendicular to the optical axis. <P>COPYRIGHT: (C)2013,JPO&INPIT |
