Patent ID: 7724447
Filing Date: 2010-05-25
Classification: G02B

Abstract:
1. A zoom lens system comprising a plurality of lens units including at least: a front lens unit having negative optical power; and a rear lens unit having positive optical power, arranged on an image side of the front lens unit, and composed of a plurality of lens elements; wherein magnification change is performed by changing an interval between the individual lens units, wherein the rear lens unit comprises: a rear A lens unit capable of moving in a direction perpendicular to an optical axis; and a rear B lens unit that is arranged on the image side of the rear A lens unit and that can move in an optical axis direction in such a manner that an interval relative to the rear A lens unit in the optical axis direction is changed, and wherein focusing adjustment during variation of the object distance is achieved by changing the interval between the rear A lens unit and the rear B lens unit.