Patent ID: 8339714

Claim:
A zoom lens, which comprises, in order from an object side to an image side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, an aperture stop, a third lens group of positive refracting power, a fourth lens group of negative refracting power, and a fifth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, at least the first lens group and the aperture stop remain fixed in position, the second lens group and the third lens group move in an optical axis direction, and a separation between each of the lens groups and the aperture stop changes, and upon focusing from a focusing-on-infinity state to a close-range-focusing state, the fourth lens group moves in the optical axis direction, with satisfaction of the following Condition (1A): −0.36 <f 4 /f 1<−0.05 (1A) where f1 is a focal length of the first lens group, and f4 is a focal length of the fourth lens group.