Patent ID: 7880976

Claim:
A zoom lens system, comprising: a first lens unit having negative optical power, the first lens unit comprising: a first lens component having negative optical power; a second lens component joined to a lens surface of the first lens component; and a third lens component having positive optical power; and a second lens unit having positive optical power, the first lens unit and the second lens unit being arranged in the stated order from an object side to an image side, wherein: an interval between the first lens unit and the second lens unit changes in zooming; the second lens component is made of a material different from a material of the first lens component and is formed in an aspherical shape in a surface on a image side of the second lens component; and when a refractive index with respect to a d-line of the material of the first lens component and an Abbe number thereof are represented as Nd 1 n and vd 1 n , respectively, the following condition is satisfied: 2.45 <Nd 1 n −(9.3×10 −5 ×vd 1 n 2 −1.7×10 −2 ×vd 1 n )<3.00 5.0<vd1n<80.0.