Patent ID: 8599493

Claim:
A zoom lens comprising: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power and configured to move during a zooming operation; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power and configured to move during a zooming operation, wherein the first lens unit has a negative lens located closest to an object side, and includes at least five lenses, and wherein the following conditional expressions are satisfied: −5.0 <h 12 w/fw<− 1.2 9.0 <f 1 /fw< 15.0 −6.0 <f 1 /f 2<−3.0 where h 12 w represents a distance between principal points of the first lens unit and the second lens unit at a wide angle end, fw represents a focal length of the entire zoom lens at the wide angle end, and f 1 represents a focal length of the first lens unit, and f 2 represents a focal length of the second lens unit.