Patent ID: 7583441
Filing Date: 2009-09-01
Classification: G02B,G03B

Abstract:
1. A photographic lens system comprising: a first lens unit including a lens component, the lens component having a negative optical power and being movable in a first direction which includes a vector component orthogonal to an optical axis; and a plurality of lens units movable during focusing from an infinite or distant object to a close-up object, the plurality of lens units being disposed on the image side of the first lens unit, wherein an image formed by the photographic lens system is displaced when the lens component moves in the first direction, wherein the photographic lens system is a fixed focal length lens system, wherein the first lens unit has a positive optical power, wherein the plurality of lens units movable during focusing includes a second lens unit having a negative optical power, a third lens unit having positive optical power and being disposed on the image side of the second lens unit, a fourth lens unit having a negative optical power and being disposed on the image side of the third lens unit, and wherein the second lens unit moves to the image side and the third lens unit moves to the object side when focusing from an infinite or a distant object to a close-up object.