Patent ID: 8792047

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 group including one or more lens units, wherein the first lens unit is closer to the object side at a telephoto end than at a wide angle end and the second lens unit is closer to the image side at the telephoto end than at the wide angle end, and wherein, when Dt 23 is a distance between the second lens unit and the third lens unit at the telephoto end, fw and ft are focal lengths of the entire zoom lens at the wide angle end and the telephoto end, respectively, f 2 is a focal length of the second lens unit, and M 2 is an amount of movement of the second lens unit in an optical axis direction during zooming from the wide angle end to the telephoto end, the following conditional expressions are satisfied: Dt 23/ √{square root over (fw*ft)}< 0.09, 0.01< |f 2|/ ft< 0.10, and −5.00< M 2/ |f 2|<−0.70.