Patent ID: 8068280
Filing Date: 2011-11-29
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; and at least two subsequent lens units, wherein the two subsequent lens units include a lens unit (A) having positive optical power and a lens unit (B) arranged on the image side relative to the lens unit (A), 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, the lens unit (B) is a focusing lens unit and moves in a direction along the optical axis, at the time of compensating image blur caused by vibration in the zoom lens system, either the entirety of a lens unit arranged on the object side relative to the lens unit (A) or a sub lens unit which is a part of a lens unit arranged on the object side relative to the lens unit (A) and is arranged on the image side therein is an image blur compensation lens unit and moves in a direction perpendicular to the optical axis, and at least one lens unit is arranged on the image side relative to the focusing lens unit, wherein the zoom lens system satisfies the following condition: f where, f f f f