Patent ID: 6989940

Claim:
A zoom lens comprising, in order from an enlarging side along an optical axis: a first lens group having negative refractive power that is movable for focusing and that is stationary during zooming; a second lens group having positive refractive power that moves during zooming; a third lens group having negative refractive power that moves during zooming; a fourth lens group having negative refractive power that moves during zooming; and a fifth lens group having positive refractive power that is stationary during zooming; wherein the second lens group, said third lens group, and said fourth lens group move relative to one another along the optical axis of the zoom lens during zooming, the second lens group moves toward the enlarging side during zooming from the wide-angle end to the telephoto end, and the fourth lens group is positioned nearer the reducing side when at the telephoto end than when at the wide-angle end.