| 摘要 |
A zoom lens system which comprises a first lens unit having positive refractive power and a second lens unit having negative refractive power, and is configured to change a magnification by varying an airspace between the first lens unit and the second lens unit, wherein the first lens unit comprises, in order from the object side, at least a first subunit having negative refractive power and a second subunit which comprises a lens component or a cemented lens component consisting of two or more lens elements and has positive refractive power, wherein the second lens unit comprises a first negative lens component, a second positive lens component and a third negative lens component which are disposed in order from the object side with airspaces interposed, and wherein the zoom lens system satisfies a condition (1) mentioned below, has a high vari-focal ratio and an unlimited back focal length and is suited for use with a 35 mm compact camera,
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