Patent ID: 7242532

Claim:
A zoom lens system with a vibration reduction mechanism comprising, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power, wherein when a state of the zoom lens system varies from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increases, and a distance between the second lens group and the third lens group decreases, wherein the third lens group comprises, in order from the object, a 31 lens group having positive refractive power, a 32 lens group having negative refractive power, and a 33 lens group, an image blur on an image plane caused by a camera shake being reduced by moving only the 32 lens group perpendicularly to the optical axis, and wherein the following conditional expression is satisfied: −2.00< f 32/ f 3<−0.80 where f 3 denotes the focal length of the third lens group and f 32 denotes the focal length of the 32 lens group.