| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a zoom lens capable of reducing a secondary chromatic aberration of magnification, having a high zoom ratio, and providing favorable optical characteristics in the entire zoom area in a positive lead type zoom lens. <P>SOLUTION: The zoom lens includes, in order from an object side to an image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a rear group including one or more lens units, and is configured to move the second lens group and at least one lens group constituting the rear group during a zooming operation. In the zoom lens, the Abbe number νdj1 and a partial dispersion ratio θgFj1 of a material of a refractive optical element j1 having a negative refractive power included in the second lens group, a focal length fj1 of the refractive optical element j1, a focal length f2 of the second lens group, and abnormal partial dispersion ratio ΔθgFj1 of the material of the refractive optical element j1 are appropriately set respectively. <P>COPYRIGHT: (C)2012,JPO&INPIT |
