Patent ID: 8873169

Claim:
A zoom lens comprising: a first lens unit that has a positive refractive power; a second lens unit that has a negative refractive power; a third lens unit that has a positive refractive power; a fourth lens unit that has a negative refractive power; and a fifth lens unit that has a positive refractive power, wherein the first to fifth lens units are arranged sequentially from an object side to an image side, wherein, in comparison with a wide-angle end, at a telephoto end, a distance between the first lens unit and the second lens unit is increased, a distance between the second lens unit and the third lens unit is decreased, a distance between the third lens unit and the fourth lens unit is increased, and a distance between the fourth lens unit and the fifth lens unit is increased, wherein, in comparison with the wide-angle end, at the telephoto end, each lens unit moves so that the first lens unit is positioned closer to the object side, wherein the first lens unit and the second lens unit each consist of a single positive lens element and a single negative lens element, and wherein, when the distance between the third lens unit and the fourth lens unit at the wide-angle end is defined as D 34 w , the distance between the third lens unit and the fourth lens unit at the telephoto end is defined as D 34 t , and a focal length of the entire zoom lens at the wide-angle end is defined as fw, the following conditional expression is satisfied: 0.2<( D 34 t−D 34 w )/ fw< 1.2.