Patent ID: 8259397
Filing Date: 2012-09-04
Classification: G02B

Abstract:
1. A wide angle zoom lens comprising: a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power, wherein the first lens group, the second lens group, and the third lens group are arranged in an order from an object side to an image side, and wherein, during zooming from the wide angle position to the telephoto position, the distance between the first lens group and the second lens group is reduced, and the second lens group is moved toward the object side, and the distance between the second lens group and the third lens group is increased, and wherein the second lens group comprises four lenses having respectively positive, positive, negative and positive refractive power, and the wide angle zoom lens satisfies the following expression: where wfov is the viewing angle at the wide angle position.