Patent ID: 7589908

Claim:
A zoom lens comprising, in order from an object side to an image 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; and a rear lens unit including one or more lens units and having an overall positive refractive power, wherein intervals between adjacent ones of the first lens unit, the second lens unit, the third lens unit, and the rear lens unit are variable and the second lens unit is movable towards the image side during zooming from a wide-angle end to a telephoto end, wherein the third lens unit is movable in a direction having a component perpendicular to an optical axis to displace an image position, wherein the third lens unit includes, in order from the object side to the image side, a first subunit having a positive refractive power, an aperture stop, and a second subunit, wherein the first subunit includes one lens component having a positive refractive power, wherein the second subunit includes a negative lens, and wherein a focal length of the first subunit (f 3 a ) and a focal length of the second subunit (f 3 b ) satisfy the following condition: −0.1< f 3 a/f 3 b< 0.1.