| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a zoom lens which has a large diameter and a wide angle of view, adequately corrects various aberrations depending on chromatic aberration and an aperture diameter, and can obtain high optical performance. <P>SOLUTION: In the zoom lens which includes a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, a fourth lens group having positive refractive power, a fifth lens group having negative refractive power and a sixth lens group having positive refractive power in order from an object side to an image side, and zooms by changing space between the respective lens groups, each of the Abbe's number νd and the partial dispersion ratio θgF of the material of a positive lens constituting the first lens group are appropriately set. <P>COPYRIGHT: (C)2012,JPO&INPIT |
