ZOOM LENS

PROBLEM TO BE SOLVED: To provide a zoom lens capable of improving image quality. SOLUTION: This zoom lens includes a first lens group with a negative refractive power and a second lens group with a positive refractive power. The first lens group includes a first lens, a second lens, a third lens and a fourth lens arranged from an object side to an image side, in sequence, and refractive powers thereof are negative, negative, negative and positive, respectively. The first and second lenses are meniscus lenses with their convex surfaces facing the object side, and two surfaces of the second lens are aspheric surfaces. The third lens is a biconcave lens. The fourth lens is a biconvex lens. The second lens group is arranged in between the image side and the first lens group. The second lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, arranged starting from the object side to the image side in sequence and refractive powers thereof are positive, positive, positive, negative and positive, respectively. A cemented doublet lens with a convex surface facing the object side is composed of the seventh and eighth lenses. The ninth lens is a biconvex lens. COPYRIGHT: (C)2008,JPO&INPIT