Patent ID: 7164540

Claim:
A zoom lens system comprising ‘n’ (n≧3) lens groups, wherein a first lens group that is the most object-side lens group of said zoom lens system has a positive refractive power, and a final lens group that is the most image-side lens group of said zoom lens system has a negative refractive power; wherein the distance from the most object-side surface of said positive first lens group to the most image-side surface of said negative final lens group becomes shortest at an intermediate focal length between the short focal length extremity and the long focal length extremity; and wherein the zoom lens system satisfies the following condition: 1.0 <f M /f W <3.0 wherein f M designates an intermediate focal length of said zoom lens system at which the distance from the most object-side surface of said positive first lens group to the most image-side surface of said negative final lens group becomes shortest; and f W designates the focal length of said zoom lens system at the short focal length extremity.