Patent ID: 8208207

Claim:
A zoom lens system comprising a negative first lens group, a positive second lens group and a positive third lens group, in that order from the object side, wherein a distance in the optical axis direction between each lens group changes during zooming from the short focal length extremity to the long focal length extremity, and wherein the following conditions (1) and (2) are satisfied: 0.20 <F 2 /Ft< 0.45 (1), and −3.00 <F 2 /fm<− 1.00 (2), wherein F2 designates the combined focal length of said second lens group, Ft designates the focal length of the entire said zoom lens system at the long focal length extremity, fm designates the focal length of the surface on the image side of the lens element that is provided closest to the image side within said second lens group, fm =(1− nm )/ rm, nm designates the refractive index at the d-line of said lens element that is provided closest to the image side within said second lens group, and rm designates the radius of curvature of said surface on the image side of said lens element that is provided closest to the image side within said second lens group.