Patent ID: 7636202

Claim:
A zoom lens system comprising, in order from an object side: a first lens unit having a negative refractive power and comprising a negative lens component and a positive lens component; and a second lens unit having a positive refractive power and comprising a positive cemented lens component which comprises a plurality of lens elements, the number of the lens components included in the first lens unit and the second lens unit being three in total, a space between the lens units changing during zooming from a wide-angle end to a telephoto end or during focusing, an image-side surface of the negative lens component of the first lens unit being an aspherical surface on which a diverging function decreases with distance from the optical axis, wherein the lens component means a single lens or a cemented lens which has only two air contact surfaces of an incidence surface and an exit surface in a clear aperture and which does not have any air space between the surfaces.