Patent ID: 8441557

Claim:
A zoom lens comprising: a first lens group that has positive refracting power and is normally located at a fixed position, a second lens group that has negative refracting power and is movable in an optical axis direction for zooming, a third lens group that has positive refracting power and is normally located at a fixed position, a fourth lens group that has positive refracting power and is movable in the optical axis direction for correction of a focal position due to the zooming and for focusing, and a fifth lens group, arranged in order from an object side to an image side, wherein the zoom lens satisfies the following conditional equations (1) and (2): (1) 1.00<f3/f4<2.49 and (2) 1.00<|fw1˜2/f2|<1.50, where f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f4 is a focal length of the fourth lens group, and fw1˜2 is a synthetic focal length of the first lens group and the second lens group at the wide-angle end.