Patent ID: 8730584

Claim:
A variable magnification optical system comprising: a first lens unit arranged nearest to an object and having a positive refractive power; a second lens unit arranged on the image plane side of the first lens unit; a G n lens unit arranged nearest to the image plane; a G n-1 lens unit arranged on the object side of the G n lens unit; an aperture stop arranged near or in the G n lens unit; and at least one lens unit arranged between the second lens unit and the G n-1 lens unit, wherein, in variable magnification, the first lens unit and the G n lens unit are fixed, wherein, in focusing, at least one lens unit arranged between the second lens unit and the G n-1 lens unit moves, and wherein at least a part of the G n lens unit moves so as to have a component in a substantially orthogonal direction to the optical axis.