| 摘要 |
A zoom lens includes: a first lens group including a negative lens, a positive lens, and a positive meniscus lens having a convex surface on an object side; a second lens group including a negative lens and a cemented lens composed of a double-concave lens and a positive lens; a third lens group including a positive lens and a negative plastic lens, and having at least one aspherical surface; a fourth lens group including a cemented lens composed of a negative plastic lens and a positive plastic lens, and having at least one aspherical surface. These lenses are arranged in the stated order from an object side. In this zoom lens, the following expression is satisfied:where fp1 represents a focal length of the negative plastic lens of the third lens group, fp2 and fp3 represent a focal length of the negative plastic lens and a focal length of the positive plastic lens of the fourth lens group, respectively, and fw represents a combined focal length of the entire system at a wide position.
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