Patent ID: 8279533

Claim:
A zoom lens comprising: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power, which are sequentially arranged from the object side of the zoom lens, wherein the focal length magnification of the zoom lens is changeable by changing a distance between the lens groups, and wherein the first lens group is composed of a first lens having negative refractive power, and the image side of which is concave, and a second lens that is an aspheric plastic lens having positive refractive power, and wherein the second lens group is composed of a cemented lens and a fifth lens of meniscus form having a convex surface facing the object side, the cemented lens being composed of a third lens of double-convex form having positive refractive power and a fourth lens of double-concave form having negative refractive power, and wherein the third lens group is composed of a sixth lens having positive refractive power, and which is a single lens, and wherein the following formula (1) is satisfied: 1.10 <fG 2 /fw< 1.33 (1), where fG 2 : the focal length of the second lens group, and fw: the focal length of the entire system of the zoom lens at wide end.