| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a zoom lens which achieves a high variable power ratio of 20 times or more and is reduced in size, and in which various aberrations are satisfactorily corrected, and to provide an imaging apparatus using the same. <P>SOLUTION: The zoom lens includes, in order from an object side, a first lens group Gr1 having a positive refractive power, a second lens group Gr2 having a negative refractive power, a third lens group Gr3 having a positive refractive power, a fourth lens group Gr4 having a negative refractive power, and a fifth lens group Gr5 having a positive refractive power, and varies power by changing the distances between the above lens groups. When varying power, each of the first lens group Gr1 to the fourth lens group Gr4 moves. The fifth lens group Gr5 is a lens group which does not move in varying power and in focusing. The zoom lens satisfies the following conditional expression: (1) 6.5<¾f1/f2¾<15.0, where f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group. <P>COPYRIGHT: (C)2013,JPO&INPIT |
