Patent ID: 7088521
Filing Date: 2006-08-08
Classification: G02B

Abstract:
1. A zoom lens system, comprising: a first lens unit of positive optical power; a second lens unit of negative optical power; and a lens component including at least one lens unit, wherein the first and second lens units and the lens component are respectively provided in order from an object side to an image side, wherein at least one of the first lens unit and the second lens unit moves during zooming, wherein at least one of the first lens unit, the second lens unit and the at least one lens unit of the lens component includes a layer made of a material having an Abbe number (νIT) and a partial dispersion ratio of g-spectral line and f-spectral line (θIT) satisfying the following conditions: wherein the layer has an optical power of a sign opposite to that of the at least one of the first and second lens units and the one lens unit of the lens component.