Patent ID: 7532412

Claim:
A zoom lens comprising, in order from an object side to an image side: a first lens unit having positive refractive power; a second lens unit having negative refractive power; and a rear lens group including at least one lens unit having positive refractive power, wherein the rear lens group includes a lens unit IS having negative refractive power which is movable in a direction having a component perpendicular to an optical axis so as to displace an imaging position, and a lens unit R_IS having positive refractive power and arranged on the image side of the lens unit IS, the distance between the lens unit IS and the lens unit R_IS being variable during zooming, and wherein the following conditions are satisfied: 0.05 <|fIS/fT|< 0.18 2.0 <f 1 /fR — IS< 4.5 where fIS is a focal length of the lens unit IS, fT is a focal length of the entire zoom lens at a telephoto end, f 1 is a focal length of the first lens unit, and fR_IS is a focal length of the lens unit R_IS.