Patent ID: 6999242
Filing Date: 2006-02-14
Classification: G02B

Abstract:
1. A zoom lens, comprising, in order from an object side to an image side: a first lens unit of negative optical power, said first lens unit consisting of, in order from the object side to the image side, a negative lens and a positive lens; a second lens unit of positive optical power; and a third lens unit of positive optical power, wherein a separation between said first lens unit and said second lens unit and a separation between said second lens unit and said third lens unit are varied to effect variation of magnification, wherein, during the variation of magnification from a wide-angle end to a telephoto end with an infinitely distant object focused on, said third lens unit moves monotonically toward the image side or moves with a locus convex toward the image side, and wherein said zoom lens satisfies the following condition: where f 1 is a focal length of said first lens unit, and ft is a focal length of said zoom lens at the telephoto end.