Patent ID: 7227700

Claim:
A wide zoom lens system comprising, in order from an object: a first lens group having negative refractive power; and a second lens group having positive refractive power; the first lens group including, in order from the object, a negative meniscus lens having a convex surface facing to the object, a negative lens, and a positive lens having a convex surface facing to the object, the second lens group including, in order from the object, a positive lens, and a negative lens, the negative meniscus lens in the first lens group having at least one aspherical surface, the focal length being varied by changing a distance between the first lens group and the second lens group, and the negative lens in the first lens group satisfying the following conditional expressions: 67<ν12 2.05 <n 12+0.007×ν12 where ν12 denotes Abbe number of the negative lens in the first lens group at d-line (λ=587.6 nm), and n12 denotes refractive index of the negative lens in the first lens group at d-line (λ=587.6 nm).