Patent ID: 8320050

Claim:
A zoom lens comprising: a first lens unit having a negative refractive power; and a second lens unit having a positive refractive power, wherein the first lens unit and the second lens unit are arranged in order from an object side to an image side and are disposed along an optical axis of the zoom lens, wherein a distance between each lens unit changes when zooming from a wide-angle end to a telephoto end, wherein the first lens unit consists of a first lens sub-unit including a positive lens element and a negative lens element, and having a negative refractive power, and a second lens sub-unit consisting of a single negative lens element, wherein focusing is performed by moving the second lens sub-unit in an optical axis direction, and wherein, when a focal length of the second lens sub-unit is f1b and a focal length of the entire zoom lens at the wide-angle end is fw, the following conditional expression is satisfied: −0.4 <fw/f 1 b<− 0.1.