Patent ID: 7336428

Claim:
A zoom lens system comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, spaces between the respective lens units being changed during zooming, the zoom lens system satisfying the following conditions (1A) through (4A): 0.80 <IH/fw <1.5 (1A); 2.7 <ft/fw <12 (2A); 0.05 <|da/f 1 G |<10 (3A); and 0 <db/f 2 G <3 (4A), wherein IH is an image height of the zoom lens system, fw is a focal length in a wide angle end of the zoom lens system, ft is a focal length in a telephoto end of the zoom lens system, f 1 G is a focal length of the first lens unit, f 2 G is a focal length of the second lens unit, da is an axial space between the first lens unit and the second lens unit at a time when a focal length fra of the zoom lens system has any value that satisfies the following condition (a): IH/ 0.92 <fra<IH/ 0.8 (a), and db is an axial space between the first lens unit and the second lens unit at a time when a focal length frb of the zoom lens system has any value that satisfies the following condition (b): 2.7 <frb/fra <5 (b).