Patent ID: 8797657

Claim:
A zoom lens comprises sequentially from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, an aperture stop, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and fifth lens group, wherein the second lens group is moved along an optical axis, from the object side toward an image side, to zoom from a wide angle edge to a telephoto edge, the fourth lens group is moved along the optical axis to correct image plane variation accompanying zooming, the third lens group includes sequentially from the object side, a positive lens having at least one aspheric surface, a cemented lens formed by a positive lens and a negative lens, and a positive lens group, the fourth lens group includes sequentially from the object side, a positive lens group, and a cemented lens formed by a positive lens and a negative lens, and the fifth lens group includes sequentially from the object side, at least one negative lens and at least one positive lens.