Patent ID: 7106522

Claim:
A zoom lens comprising, in order from an object side: a first lens group having a negative refractive power, comprising a first lens having a negative refractive power and a second lens having a positive refractive power, wherein the first lens includes a convex meniscus surface facing the object side; a second lens group having a positive refractive power, comprising a third lens having a positive refractive power and a fourth lens having a negative refractive power; and a third lens group having a positive refractive power, comprising at least one fifth lens having a positive refractive power; wherein a distance between the third lens group and an image side is greater at a wide-angle position than at a telephoto position, and wherein the zoom lens satisfies the expressions, 1.0 ≤ L II f W ⁢ f T ≤ 1.5 , and ⁢ ⁢ 1.2 ≤  f I  f W ⁢ f T ≤ 1.5 , and 1.2 ≤  f I  f W ⁢ f T ≤ 1.5 , wherein f W denotes the total focal length at the wide-angle position; f T denotes the total focal length at the telephoto position; L II denotes the moving distance of the second lens group from the wide-angle position to the telephoto position; and f I denotes the focal length of the first lens group.