Patent ID: 8537250

Claim:
A zoom lens comprising: a first lens group having a positive refractive power; a second lens group disposed in back of the first lens group, having a negative refractive power, and selectively moveable in an optical axis direction to perform zooming; a third lens group disposed in back of the second lens group, having a positive refractive power, and comprising: a third-A lens group comprising a doublet lens formed by bonding a positive lens to a negative lens, selectively moveable in a direction perpendicular to the optical axis direction to compensate for an image blur, and having a positive refractive power, wherein a lens surface of the doublet lens closest to the object side is aspheric; and a third-B lens group disposed in back of the third-A lens group and comprising at least one positive lens and at least one negative lens; a fourth lens group disposed in back of the third lens group, having a positive refractive power, and selectively moveable in the optical axis direction to compensate a variation in an image plane caused by the zooming and to perform focusing; and an aperture stop disposed between the second and third lens groups.