| 摘要 |
A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a subsequent lens unit including at least two lens units. An interval between respective adjacent lens units varies for zooming. The first lens unit includes a positive lens and a negative lens. A deviation, from a standard line, of a material of a negative lens GLn, whose relative partial dispersion of a material (&thetas;gF) is the lowest of relative partial dispersions of materials of other lenses included in the first lens unit (&Dgr;&thetas;gF1n), an Abbe number of the material of the negative lens GLn (&ngr;1n), a focal length of the negative lens GLn (f1n), a deviation, from a standard line, of a material of a positive lens GNLp, whose relative partial dispersion of a material (&thetas;gF) is the highest of relative partial dispersions of materials of other lenses included in the first lens unit (&Dgr;&thetas;gF1p), an Abbe number of the material of the positive lens GNLp (&ngr;1p), a focal length of the positive lens GNLp (f1p), and a focal length of the entire zoom lens system at a telephoto end (ft) are appropriately set. |
