Patent ID: 8760771

Claim:
A zoom lens comprising: an aperture stop; and a plurality of lens units which are moved during zooming, wherein the plurality of lens units includes, on an object side of the aperture stop, a positive lens unit Lp having a positive refractive power and a negative lens unit Ln having a negative refractive power which is disposed to be adjacent to an image side of the positive lens unit Lp, wherein at least one of the positive lens unit Lp and the negative lens unit Ln includes two or less lenses which are moved during focusing, and wherein a composite focal length of lens units disposed on the image side of the negative lens unit Ln at a wide-angle end is positive, and a composite focal length of lens units disposed on the object side of the positive lens unit Lp at the wide-angle end is negative, wherein, when focal lengths of the positive and negative lens units Lp and Ln are respectively denoted by Fp and Fn, and a lateral magnification of the negative lens unit Ln at a wide-angle end is denoted by βnw, the following conditions are satisfied: 0.5 <|Fp/Fn| <2.0, |β nw|< 1.0.