| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens that excellently corrects a primary axial chromatic aberration and a secondary spectrum while increasing its diameter and that has high optical performance in an entire zoom range.SOLUTION: A zoom lens includes, in order from an object side to an image side, a first lens group L1 having negative refractive power and a second lens group L2 having positive refractive power, and changes a distance between the lens groups adjacent to each other during zooming operation. When νd2n represents an Abbe number of a material of a negative lens included in the second lens group L2 and θgF2n represents a partial dispersion ratio, the zoom lens satisfies the following conditional expressions: θgF2n<3.13×10×νd2n-1.86×10×νd2n+0.878, 5.0<νd2n<25.0.SELECTED DRAWING: Figure 1 |
