Patent ID: 7405885

Claim:
A zoom lens, comprising: a first lens group with a negative refractive power, comprising 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 being negative, negative, negative and positive respectively, wherein 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 and the fourth lens is a biconvex lens; and a second lens group with a positive refractive power, disposed between the first lens group and the image side, the second lens group comprising a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged from the object side to the image side in sequence and refractive powers thereof being positive, positive, positive, negative and positive respectively, wherein a cemented doublet lens with a convex surface facing the object side is composed of the seventh and eighth lenses, and the ninth lens is a biconvex lens, wherein the first lens group and the second lens group are suitable for moving between the object side and the image side.