Patent ID: 6414800
Filing Date: 2002-07-02
Classification: G02B

Abstract:
A variable magnification optical system comprising, in order from an object side to an image side:a first lens unit of positive refractive power; a second lens unit of negative refractive power arranged to move along an optical axis during variation of magnification, said second lens unit comprising, in order from the object side to the image side, a first lens (L21) of negative refractive power and of meniscus form having a concave surface facing the image side, a second lens (L22) of negative refractive power, a third lens (L23) of positive refractive power and a fourth lens (L24) of negative refractive power; a third lens unit of positive refractive power, at least a part of said third lens unit being moved in such a way as to have a component perpendicular to the optical axis to displace an image formed by said variable magnification optical system; and a fourth lens unit of positive refractive power arranged to move along the optical axis during the variation of magnification, wherein the following condition is satisfied: 0.052/ft|<0.07 where ft is a focal length of said variable magnification optical system in a telephoto end, and f2 is a focal length of said second lens unit.