Patent ID: 7982970

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 reflection member configured to bend an optical path; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, wherein during zooming from a wide-angle end to a telephoto end, two or more lens units among the first through the third lens units move and a distance between the second and the third lens units decreases, and wherein the third lens unit includes a first lens sub-unit, and a second lens sub-unit configured to move in a direction having a component perpendicular to an optical axis to displace an image forming position, wherein a lateral magnification of the second lens sub-unit when focusing on an infinitely-distant object at the telephoto end (β 3 b ), an overall lateral magnification of a lens section located closer to the image side than the second lens sub-unit (βr), a distance from a lens surface of the third lens unit closest to the object side to a lens surface of the second lens sub-unit closest to the object side (L 3 is), and a thickness of the third lens unit in the direction of the optical axis (DL 3 ) satisfy the following conditions: 1<(1−β3 b )β r <3 0.3 <L 3 is/DL 3<0.99.