| 摘要 |
A zoom lens including a first lens group having a negative refractive power, including a negative lens and a positive lens and having at least one aspherical surface, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. During, zooming from a wide angle position to a telephoto position, the first lens group is moved so that the first lens group at the telephoto position is closer to the object side than the first lens group at the wide angle position, the second lens group is moved, the third lens group is moved toward the object side from the image side, and the fourth lens group is moved so that the distance between the third lens group and the fourth lens group at the telephoto position is larger than the distance therebetween at the wide angle position, and the zoom lens satisfies the following Equations: vdG1−p>56.0 2.1<|&bgr;3T/&bgr;3W|<5.5, where vdG1−p is the Abbe's number of the positive lens of the first lens group, &bgr;3T is the magnification of the third lens group at the telephoto position and &bgr;3W is the magnification of the third lens group at the wide angle position, respectively. |
