Patent ID: 7227695

Claim:
A zoom lens system comprises a negative first lens group, a diaphragm, a positive second lens group, and a positive third lens group, in this order from an object: wherein zooming is performed by moving said negative first lens group and said positive second lens group in the optical axis direction; wherein said zoom lens system comprises six lens elements; wherein a negative first lens element and a positive second lens element, in this order from the object, are arranged to constitute said negative first lens group; wherein a positive third lens element, a negative fourth lens element and a positive fifth lens element, all of which are bonded to each other, in this order from the object, are arranged to constitute said positive second lens group; wherein a positive sixth lens element is arranged to constitute said positive third lens group; wherein upon zooming from the short focal length extremity to the long focal length extremity, a distance between said negative first lens group and said positive second lens group decreases; and wherein a distance between said positive second lens group and said positive third lens group increases, while said positive third lens group remains stationary with respect to the image plane.