Patent ID: 7859766

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 fourth lens unit having a positive refractive power, each of the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit moving to perform zooming, wherein the following conditions are satisfied: −0.50 <M 3/ Lt<− 0.25; and 0.20 <f 3/ ft< 0.40, where M 3 represents a moving amount of the third lens unit on an optical axis during zooming from a wide angle end to a telephoto end, Lt represents a total lens length on the telephoto end, f 3 represents a focal length of the third lens unit, and ft represents a focal length of an entire lens system on the telephoto end.