Patent ID: 7403341

Claim:
A zoom lens system comprising, in order from an object side: a first lens unit comprising two lens components; and a second lens unit comprising one lens component, the number of the lens components included in the first lens unit and the second lens unit being three in total, during zooming from a wide-angle end to a telephoto end, at least a space between the first lens unit and the second lens unit changing, the first lens unit and the second lens unit including aspherical lens surfaces, at least one aspherical surface of the first lens unit satisfying the following condition: R 1 /h 1 <1.35 (1), wherein R 1 denotes a paraxial radius of curvature of the at least one aspherical surface, and h 1 denotes a length from a first intersection between a chief ray reaching a point of maximum image height on an image surface and the at least one aspherical surface to an optical axis in the wide-angle end at a time when the chief ray enters the zoom lens system with an angle of incidence equal to or larger than 36 degrees and passes through the at least one aspherical surface.