Patent ID: 7961405

Claim:
A zoom lens comprising: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, wherein the first lens unit, the second lens unit, and the third lens unit are arranged in order from an object side to an image side, wherein the first, second, and third lens units move during zooming, wherein the first lens unit is formed by two lenses, wherein the third lens unit is formed by one lens, and wherein the following conditional expressions are satisfied: −0.58<β2 w<− 0.40 0.30<| f 1/ f 3|<0.50 −3.0< m 1/ fw<− 1.3 where β 2 w represents a lateral magnification of the second lens unit at a wide angle end, f 1 represents a focal length of the first lens unit, f 3 represents a focal length of the third lens unit, fw represents a focal length of the entire zoom lens at the wide angle end, m 1 represents a moving amount of the first lens unit along an optical axis from the wide angle end to a telephoto end, and a sign of the moving amount is a positive sign when the first lens unit moves towards the image side.