Patent ID: 8908284

Claim:
A zoom lens comprising, in order from the object side to the image side: a first lens unit of positive refractive power; a second lens unit of negative refractive power; a third lens unit of positive refractive power; a fourth lens unit of negative refractive power, and a rear lens unit, wherein the rear lens unit includes, in order from the object side to the image side, a first lens subunit of positive refractive power, a second lens subunit of negative refractive power, and a third lens subunit of positive refractive power, wherein during zooming, the distance between the first lens unit and the second lens unit, the distance between the second lens unit and the third lens unit, the distance between the third lens unit and the fourth lens unit, and the distance between the fourth lens unit and the first lens subunit each change, wherein the second lens subunit is movable in a direction having a component perpendicular to the optical axis, and wherein the following conditional expressions are satisfied: 0.73 <|f 12 w|/f 3 Rw< 2.0, and 0.8 <|fis|/fRt< 2.5, where f12w is the combined focal length of the first lens unit and the second lens unit during focusing on an object at infinity at the wide-angle end, f3Rw is the combined focal length of the third lens unit and the lens units placed on the image side of the third lens unit during focusing on an object at infinity at the wide-angle end, fis is the focal length of the second lens subunit, and fRt is the combined focal length of the rear lens unit during focusing on an object at infinity at the telephoto end.