Patent ID: 7616386

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; and a rear unit which includes at least one lens unit, wherein at least the second lens unit moves during zooming such that a distance between the first and second lens units is larger at a telephoto end than at a wide-angle end, wherein the first lens unit includes at least a first lens element made of a material which satisfies the following conditions: Nd 1 a >2.3−0.01·ν d 1 a 1.65<Nd1a<2.70 where Nd 1 a denotes a refractive index for a d-line, and νd 1 a denotes an Abbe number for the d-line, and wherein the first and second lens units satisfy the following condition: 2.5<| f 1/ f 2|<12.0 where f 1 denotes a focal length of the first lens unit, and f 2 denotes a focal length of the second lens unit.