Patent ID: 7471462

Claim:
A zoom lens comprising in order from the object side to the image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; and a third lens unit having a positive refractive power, wherein the first lens unit and the third lens unit move in the optical axis direction during zooming, and wherein the following conditions are satisfied: 0.60 <m 3 /m 1<0.90, and 0.080 <|f 2 /ft|< 0.120, where m 1 and m 3 are maximum moving distances in the optical axis direction of the first lens unit and the third lens unit, respectively, in zooming from a wide-angle end to a telephoto end, ft is a focal length of the zoom lens at the telephoto end, and f 2 is a focal length of the second lens unit.