Patent ID: 8325422

Claim:
A zoom lens disposed between an object side and an image side, the zoom lens comprising from the object side to the image side arranged in sequence: a first lens group having a negative refractive power, the first lens group comprising a first lens and a prism arranged in sequence from the object side to the image side, and the first lens being an aspheric lens, wherein a distance between the first lens and the prism is L, an effective focal length of the zoom lens at a wide-end is fw, and 1.58<L/fw<1.88; a second lens group having a positive refractive power and disposed between the first lens group and the image side, and the second lens group comprising a first double cemented lens; a third lens group having a negative refractive power and disposed between the second lens group and the image side, and the third lens group comprising a second double cemented lens; and a fourth lens group having a positive refractive power and disposed between the third lens group and the image side.