Patent ID: 7982967
Filing Date: 2011-07-19
Classification: G02B

Abstract:
1. A zoom lens comprising: 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 group including at least one lens unit, wherein the first lens unit, the second lens unit, the third lens unit, and the rear group are arranged in order from an object side to an image side, wherein, during zooming from a wide angle end to a telephoto end, the first lens unit moves to the object side, the second lens unit moves to the image side, and the third lens unit moves to the object side, and wherein the following conditional expressions are satisfied: where M 1 , M 2 , and M 3 represent moving amounts of the first lens unit, the second lens unit, and the third lens unit for zooming from the wide angle end to the telephoto end, and f 2 and f 3 represent focal lengths of the second lens unit and the third lens unit.