Patent ID: 8503094

Claim:
A zoom lens comprising, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein the first lens unit has a negative lens and a positive lens in order from the object side, wherein the second lens unit has an object-side negative lens, an image-side negative lens, and a positive lens in order from the object side, the zoom lens satisfying a condition of the following expression: 0.005<(− f 2)× f 3/( f 1 2 )<0.023, where f1 is the focal length of the first lens unit, f2 the focal length of the second lens unit, and f3 the focal length of the third lens unit.