Patent ID: 8213092

Claim:
A zoom lens, comprising, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power, wherein intervals between the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit are changed during zooming, and wherein the following conditions are satisfied: 4.5 <|f 3 /fW|< 30.0; and 5.0 <m 2 /fW< 10.0, where fW indicates a focal length of the entire zoom lens at a wide angle end, f 3 indicates a focal length of the third lens unit, and m 2 indicates a movement amount of the second lens unit during zooming from the wide angle end to a telephoto end.