Patent ID: 7209299

Claim:
A vibration reduction zoom lens system comprising, in order from an object; a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power; all distances between adjacent lens groups being changed upon zooming from a wide-angle end state to a telephoto end state; the third lens group comprising a plurality of lenses including a cemented lens constructed by a negative lens and a positive lens; only the cemented lens being used as a vibration reduction lens shifting substantially perpendicularly to the optical axis for correcting camera shake; and the following conditional expression being satisfied: 0.6<| f 3 A|/|f 3|<2.6 where f 3 A denotes the focal length of the vibration reduction lens of the third lens group, and f 3 denotes the focal length of the third lens group.