Variable power optical system and image pick-up apparatus having the same

Abstract

A variable power optical system includes, from an object in order, a first lens group having a positive refracting power and consisting of a positive singlet lens or the combination of one positive lens and one negative lens, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a fourth lens group having a positive refracting power, wherein at least the second lens group and the third lens group are moved during a variation in magnification and an image is displaced by shifting the entire second lens group or the entire third lens group so as to have a component in a direction orthogonal to the optical axis. Also, a variable power optical system comprises, from an object in order, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a fourth lens group having a positive refracting power, wherein the first lens group, the second lens group, and the third lens group are moved during a variation in magnification and an image is displaced by shifting the entire third lens group so as to have a component in a direction orthogonal to the optical axis.

Dependencies are inferred from the claim text.