| 摘要 |
PROBLEM TO BE SOLVED: To provide a large-aperture wide-angle standard zoom lens which corrects well for chromatic aberration and aperture-related aberrations (spherical aberration, coma aberration, etc.), and provides superior optical performance.SOLUTION: A zoom lens includes a negative first lens group and a positive second lens group arranged in order from the object side, and a distance between the first lens group and the second lens group is narrowed when zooming from the wide angle end to the telephoto end. The first lens group includes at least one positive lens which satisfies a conditional expression: 0.02<&thetas;gF-0.6438+0.001682×&ngr;d<0.1...(1), where &thetas;gF represents an abnormal partial dispersion value and &ngr;d represents an Abbe number. |
