Patent ID: 7468845

Claim:
A zoom lens, suitable for imaging an object on a photosensitive element, comprising: a first lens group, having a positive refractive power; a second lens group, having a negative refractive power and disposed between the first lens group and the photosensitive element; a third lens group, having a positive refractive power and disposed between the second lens group and the photosensitive element, wherein the third lens group includes two lenses having positive refractive power, and the second lens group is suitable for moving between the first lens group and the third lens group; and a fourth lens group, having a positive refractive power and disposed between the third lens group and the photosensitive element, the fourth lens group suitable for moving between the third lens group and the photosensitive element, the fourth lens group including: a ninth lens, having a negative refractive power; and a tenth lens, having a positive refractive power, and disposed between the ninth lens and the photosensitive element.