Patent ID: 8848296

Claim:
A zoom lens comprising, in order from an object side along an optical axis: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a negative refractive power; a fourth lens group having a positive refractive power; and a fifth lens group having a positive refractive power, wherein with a change in a magnification from a wide-angle end to a telephoto end, an interval between the first lens group and the second lens group is increased, the interval between the second lens group and the third lens group is changed, the interval between the third lens group and the fourth lens group is decreased, the interval between the fourth lens group and the fifth lens group is decreased, and focusing is performed by the third lens group, and the following condition (1) is satisfied where a summation of thickness of each of the first to fifth lens groups in the optical axis direction is Dg, a distortion in the wide-angle end in infinity focusing is Disw, an image height is Y′, and an intermediate focal length Fm is Fm=√(Fw×Ft) where a focal length in the wide-angle end is Fw and a focal length in the telephoto end is Ft 3×10 −3 <|( Dg×Disw )/( Y′×Fm )|<1×10 −2 [1].