(EN) The invention provides a zoom lens and an optical apparatus. This zoom lens is provided with, in order from the object side along the optical axis: a first lens group having negative refractive power;a second lens group having a positive refractive power; a third lens group having a negative refractive power; and a fourth lens group, zoom, the interval between the first lens group and the secondlens group changes. The interval between the second lens group and the third lens group changes. The interval between the third lens group and the fourth lens group varies, and satisfies the followingconditional expressions: 1.500 <(-f3)/fw<10,000), wherein f3 is the focal length of the third lens group, and fw is the focal length of the entire system of the zoom lens in a wide-angle end state.
(ZH) 本发明提供一种变焦镜头以及光学设备。变焦镜头沿着光轴从物体侧依次具备：具有负的光焦度的第1透镜组；具有正的光焦度的第2透镜组；具有负的光焦度的第3透镜组；以及第4透镜组，在进行变倍时，所述第1透镜组与所述第2透镜组之间的间隔变化，所述第2透镜组与所述第3透镜组之间的间隔变化，所述第3透镜组与所述第4透镜组之间的间隔变化，且满足以下的条件式：1.500<(‑f3)/fw<10.000其中，f3：所述第3透镜组的焦距，fw：广角端状态下的所述变焦镜头整个系统的焦距。
