Zoom lens and image pickup apparatus including the lens

Abstract

A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a positive refractive power. The first to third lens units are arranged in that order from an object side toward an image side, and change the distances therebetween during zooming. The following conditions are satisfied: 0.70<f2/√{square root over ((fW·fT))}<0.95, and 2.9<(β2T·β3W)/(β2W·β3T)<3.7 where fW and fT respectively represent the focal lengths of the entire zoom lens at a wide angle end and a telephoto end, f2 represents the focal length of the second lens unit, β2W and β2T respectively represent the imaging magnifications of the second lens unit at the wide angle end and the telephoto end, and β3W and β3T respectively represent the imaging magnifications of the third lens unit at the wide angle end and the telephoto end.

Dependencies are inferred from the claim text.