Patent ID: 7548380

Claim:
A zoom lens comprising: a first lens group located adjacent to a object side and having a total negative refractive power; and a second lens group located adjacent to a image side and having a total positive refractive power, wherein zooming occurs as a interval between the first lens group ad the second lens group is varied, wherein the zoom lens satisfies - 4 < f ⁢ ⁢ 1 Zr < - 0.5 , where f 1 denotes a focal distance of the first lens group, and Zr denotes a ratio of a focal distance at a telephoto position to a focal distance at a wide angle position (ft/fw), wherein the first lens group comprises, sequentially from the object side to the image side: a first lens and a second lens, wherein the second lens group comprises, from the object side to the image side: an iris, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein at least one surface of the fourth lens is an aspheric surface.