Patent ID: 7382551

Claim:
A zoom lens system comprising: a first lens unit having negative refractive power; and a second lens unit having positive refractive power, wherein, the first and second lens units are provided in order from the object side to the image side, the distance between the first and second lens units change during zooming, the first lens unit includes a compound optical element including a lens element and a resin layer having optical performance different from the optical performance of the lens element and being stacked on the lens element, and wherein the compound optical element satisfies 20 <|νdg−νdj | and fg/fj< 0, where fg represents the focal length of the lens element, νdg represents the Abbe number of the material of the lens element, fj represents the focal length of the resin layer, and νdj represents the Abbe number of the resin layer.