Patent ID: 7324289

Claim:
A zoom lens system comprising, in order from an object side thereof: a first lens group that has negative refractive power; a second lens group that has positive refractive power; and a third lens group that has positive refractive power, wherein zooming is carried out by moving the first lens group and the second lens group, the first lens group consists of two or three lenses that include a negative glass lens located closest to the object side, the second lens group consists, in order from the object side, of a cemented lens composed of a positive glass lens and a negative glass lens and a plastic meniscus lens that is convex on the object side, both surfaces of the plastic meniscus lens being aspherical, the third lens group consists of one positive plastic lens, and a combined focal length f 2 of the second lens group and a focal length Lf 23 of the plastic meniscus lens in the second lens group satisfy the following condition 0<| f 2/ Lf 23 |<0.3.