Patent ID: 6922290

Claim:
A zoom lens system comprising: a positive first lens group including a positive lens element having a convex surface facing an object, a negative lens element, a positive lens element, and a positive lens element having at lease one aspherical surface, in this order from the object and; a negative second lens group, in this order from the object, wherein zooming is performed by moving said first and second lens groups in the optical axis direction thereof; and wherein said zoom lens system satisfies the following conditions: 4.5 <f T /f 1G <5.5 4 <f T /f L3 <6 3.5 <f T /f Lasp <5.5 wherein f T designates the focal length of said zoom lens system at the long focal length extremity; f L3 designates the focal length of a third lens element from said object in said positive first lens group; f 1G designates the focal length of said positive first lens group; and f Lasp designates the focal length of said positive lens element having said aspherical surface in said positive first lens group.