Patent ID: 7259920

Claim:
A zoom lens having in succession from an object side to an image side: a first lens unit of negative optical power, at least one of the object side and image side surfaces of a lens element of said first lens unit which is most adjacent to the object side is of an aspherical shape; a second lens unit of positive optical power, at least one of the object side and image side surfaces of a lens element of said second lens unit which is most adjacent to the object side is of an aspherical shape; and a third lens unit of positive optical power; wherein an interval between adjacent ones of said lens units changes in case of zooming, and when the refractive indices of the materials of said lens element of said first lens unit and said lens element of said second lens unit are defines as n1n and n2p, respectively, the following conditions are satisfied: 1.85<n1n 1.85<n2p.