Patent ID: 7139131

Claim:
A zoom lens system, comprising: a first lens unit with a positive optical power, having a negative lens element; a second lens unit with a negative optical power; an aperture stop; and a rear lens component including at least one lens unit, which are arranged in an order from an object side to an image side, wherein: during zooming from a wide angle end to a telephoto end, an interval between the first lens unit and the second lens unit increases, and an interval between the second lens unit and the aperture stop decreases; and the following conditions are satisfied: νd1n<35 θ gf 1 n<− 0.0027 νd 1 n+ 0.680 where an Abbe number of a material constituting the negative lens element is νd 1 n , and a partial dispersion ratio is θgF 1 n.