Patent ID: 8659832

Claim:
A zoom lens comprising in order from an object side to an image side: a first lens unit having a positive refractive power that does not move for zooming; a magnification-varying system having at least a second lens unit having a negative refractive power that moves during zooming and a third lens unit having a positive refractive power that moves during zooming; and a fourth lens unit having a positive refractive power that does not move for zooming, wherein the fourth lens unit includes: a first lens subunit having a negative refractive power; a second lens subunit having a negative refractive power that moves in a direction having a component perpendicular to an optical axis so as to displace an image in a direction perpendicular to the optical axis; and a third lens subunit having a positive refractive power, wherein the following conditional expression is satisfied: 1.2 <f 41 /f 42<3.5, where f41 represents a focal length of the first lens subunit, and f42 represents a focal length of the second lens subunit.