Patent ID: 7330316
Filing Date: 2008-02-12
Classification: G02B

Abstract:
1. 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; a third lens group having positive refractive power; and a fourth lens group having negative refractive power, when a state of lens group positions varies from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, a distance between the second lens group and the third lens group decreasing, and a distance between the third lens group and the fourth lens group varying, the fourth lens group being composed of, in order from the object, a 41 lens group, a 42 lens group having negative refractive power, and a 43 lens group, at least one of the 41 lens group and the 43 lens group having positive refractive power, and image blur on an image plane caused by a camera shake being reduced by moving only the 42 lens group perpendicular to the optical axis.