Patent ID: 7382550

Claim:
A zoom lens comprising: a first lens group with negative refractive power; a second lens group with positive refractive power; a third lens group with negative refractive power; and a fourth lens group with positive refractive power, which are arranged from an object side to an image side in that order, wherein each of the lens groups moves so that the space between the first lens group and the second lens group is reduced, the space between the second lens group and the third lens group is increased, and the space between the third lens group and the fourth lens group is reduced, at a telephoto end in comparison with spacing at a wide angle end, wherein the second lens group includes a second A lens component composed of a single positive lens, and a second B lens component composed of a negative lens and a positive lens with positive refractive power as a whole, which are arranged from the object side to the image side in that order, the second A lens component displacing images in a direction substantially perpendicular to an optical axis by having a component of it's displacement perpendicular to the optical axis, and wherein the zoom lens satisfies the following condition: 0.2 <f 2 /f 2 A< 0.6, where f2A and f2 are focal lengths of the second A lens component and the second lens group, respectively.