| 摘要 |
A zoom lens includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group, which are arranged in this order from the object side of the zoom lens. The focal length of the entire system of the zoom lens is changeable by changing a distance between the second lens group and the third lens group. The first lens group includes two cemented lenses, each composed of a negative meniscus lens and a positive lens cemented together in this order from the object side, and a positive lens, and the two cemented lenses and the positive lens being arranged in this order from the object side. Further, a predetermined formula related to the focal length of the first lens group and the focal length of the entire system is satisfied. |
