Patent ID: 7417802

Claim:
A zoom lens comprising, in the following order from the object side to the image side: a positive first lens unit; a negative second lens unit, the second lens unit moving during zooming; a positive third lens unit; and a positive fourth lens unit, the fourth lens unit moving during zooming, wherein the first lens unit includes a negative lens subunit and a positive lens subunit, the negative lens subunit includes at least two negative lenses each having a concave surface facing the image side and at least one positive lens arranged in the mentioned order from the object side, and the positive lens subunit includes at least one biconvex positive lens, a negative lens and at least two positive lenses arranged in the mentioned order from the object side, or at least one biconvex positive lens, a cemented lens composed of a negative lens and a positive lens and at least one positive lens arranged in the mentioned order from the object side.