Patent ID: 7623298
Filing Date: 2009-11-24
Classification: G02B

Abstract:
1. A zoom lens, comprising: a first lens group having a negative focal length, a second lens group having a positive focal length, a third lens group having a negative focal length, a fourth lens group having a positive focal length, and a fifth lens group having a positive focal length, which are disposed in order from nearest to furthest from a subject; wherein: the first lens group includes a reflective optical element; the third lens group includes an aperture stop which is disposed in a subject side or an image side of the third lens group or within the third lens group; and when magnifying from a short focus end to a long focus end, an interval between the first lens group and the second lens group is configured to reduce, an interval between the second lens group and the third lens group is configured to increase, an interval between the third lens group and the fourth lens group is configured to reduce, an interval between the fourth lens group and the fifth lens group is configured to increase, and the fifth lens group is moved toward the subject.