Patent ID: 8264779

Claim:
A zoom lens comprising, in order from an object side to an image side and arranged along an optical axis, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, a fourth lens unit having positive or negative refractive power, and a fifth lens unit having positive refractive power, wherein when zooming from the wide-angle end to the telephoto end, the second lens unit moves monotonically to the image side, the third lens unit moves to the object side in a convex locus, the fifth lens unit moves nonlinearly, and the first and fourth lens units do not move for zooming, the fourth lens unit including a first sub lens unit having negative refractive power and a second sub lens unit having positive refractive power, and the first sub lens unit being moved so as to have a component perpendicular to the optical axis to thereby move the imaging position in a direction perpendicular to the optical axis, wherein the first sub lens unit includes a first lens having negative refractive power and a second lens having positive or negative refractive power and satisfies the following conditions: |f 4 /fw|> 10.0 ν411>60.00 ν412<35.00 where f4 is the focal length of the fourth lens unit, fw is the focal length of the entire system at the wide-angle end, ν411 is the Abbe number of the material of the first lens, and ν412 is the Abbe number of the material of the second lens.