| 摘要 |
An zoom lens includes a front unit having positive refractive power, an aperture stop, and a rear unit. The front unit has a positive lens Gp1 and the rear unit has a negative lens Gn1. When an Abbe number of a material of the positive lens Gp1, and a partial dispersion ratio of the material thereof for a g-line and an F-line is defined as &ngr;dp1 and &thetas;gFp1 respectively, and a refractive index and an Abbe number of a material of the negative lens Gn1 for a d-line, and a partial dispersion ratio of the material thereof for the g-line and the F-line is defined as Ndn1 &ngr;dn1 and &thetas;gFn1 respectively, satisfying the following conditions: 75<&ngr;dp1<99, 0.020<&thetas;gFp1−0.6438+0.001682×&ngr;dp1<0.100, 1.75<Ndn1<2.10, and 0.020<&thetas;gFn1−0.6438+0.001682×&ngr;dn1<0.100.
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