Patent ID: 8194317
Filing Date: 2012-06-05
Classification: G02B

Abstract:
1. A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having negative optical power; a fourth lens unit; and a fifth lens unit, wherein at the time of zooming, all lens units move in a direction along an optical axis so that intervals between the lens units vary, at the time of focusing, either a part of the fifth lens unit or an entirety of the fifth lens unit is a focusing lens unit and moves in a direction along the optical axis, and the focusing lens unit has negative optical power, wherein the third lens unit is an image blur compensation lens unit and moves in a direction perpendicular to the optical axis at the time of compensating image blur caused by vibration in the zoom lens system, and the zoom lens system satisfies the following condition: where, f f f