Patent ID: 6903878

Claim:
A zoom lens comprising, in order from the object side toward the image side: a first lens unit having negative optical power, the first lens unit having a negative meniscus lens in which the concave surface is directed toward the image side and a positive meniscus lens in which the convex surface is directed toward the object side; an aperture stop; a second lens unit having positive optical power, the second lens unit having at least one positive lens and at least one negative lens, and a third lens unit having positive optical power, the third lens unit moving during zooming, wherein: the following distances are changed in said zoom lens during zooming such that; the distrance between said first lens unit and said aperture stop is narrower at the telephoto end than at the wide angle end, the distance between said aperture stop and said second lens unit is narrower at the telephoto end than at the wide angle end, and the distance between said second lens unit and said third lens unit is wider at the telphoto end than at the wide angle end; and the following condition is satisfied: 0<( Dw−Dt )/ fw< 1 where Dw is the distance between said aperture stop and said second lens unit at the wide angle end; Dt is the distance between said aperture stop and said second lens unit at the telephoto end; and fw is the focal length at the wide angle end.