Patent ID: 8248704

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; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, wherein intervals between the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit are changed during zooming, wherein the following conditional expressions are satisfied: 9.8 <|f 1 /f 2|<12.5; and 5.0 <f 5 /fw< 7.5; where fw denotes a focal length of an entire system at a wide angle end, and fn denotes a focal length of an n-th lens unit.