Patent ID: 7068428

Claim:
A zoom lens system comprising: a plurality of lens units, including: a first lens unit with positive optical power; a second lens unit with negative optical power; a third lens unit with positive optical power; a fourth lens unit with positive optical power; a fifth lens unit with negative optical power; and a sixth lens unit with positive optical power, wherein the first through sixth lens units are disposed from the object side to the image side along the optical axis, respectively, wherein spaces are provided between adjacent lens units, wherein during a zooming operation, the spaces change, wherein the fifth lens unit is movable so as to have a direction perpendicular to the optical axis, and wherein a focal distance fis of the fifth lens unit and a focal distance ft of the zoom lens system at a telephoto end satisfy the following condition: 0.05<|fis|/ft<0.25, wherein a focal distance fRB 2 of the sixth lens unit satisfies the following condition: 0.2 <fRB 2 /ft< 0.5.