Patent ID: 8749613
Filing Date: 2014-06-10
Classification: G02B

Abstract:
1. A wide-angle zoom lens for imaging an object on an imaging surface, in the order from the object side to the image side, the wide-angle zoom lens comprising: a first lens group with positive refraction power; a second lens group with negative refraction power; a third lens group with positive refraction power; and a fourth lens group with positive refraction power, the first lens group, the second lens group, the third lens group, and the fourth lens group being capable of moving along an optical axis of the wide-angle zoom lens; wherein the wide-angle zoom lens satisfies the formulas: 6<f3/fw<2.1; where f3 is the effective focal length of the third lens group, and fw is the effective focal length of the wide-angle zoom lens in a wide angle state; the first lens group comprises, in the order from the object side to the image side of the wide-angle zoom lens, a first lens with negative refraction power and a second lens with negative refraction power; the wide-angle zoom lens further satisfies the formulas: 55<V2/V1<1.95; where V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.