Patent ID: 8693107
Filing Date: 2014-04-08
Classification: G02B

Abstract:
1. A zoom lens comprising: a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power, and a fourth lens group having a positive refracting power arranged in order from an object side to an image side along an optical axis, wherein the second lens group includes three lenses, that is, a negative lens, a positive lens, and a negative lens in order from the object side to the image side, wherein the third lens group includes three lenses, that is, a positive lens, a negative lens, and a positive lens in order from the object side to the image side and wherein the first lens group, the second lens group, the third lens group and the fourth lens group move along the optical axis to and between a wide-angle end state and an intermediate state and to and between the intermediate state and a telephoto end state such that: