Long-focus long-flange video lens

The invention discloses a long-focus long-flange video lens, which is characterized in that the long-focus long-flange video lens sequentially comprises a first lens group, an iris diaphragm and a second lens group along a light incidence direction, the first lens group and the second lens group both have positive focal power, the first lens group is a fixed group, and the second lens group is a focusing group capable of moving along an optical axis; the first lens group and the second lens group satisfy the following relationship: 0.45 lt; f2/f1lt; f1 represents the focal length value of the first lens group, and f2 represents the focal length value of the second lens group. The optical lens can realize large aperture, high resolution, small distortion and long flange back focus, has excellent close-range focusing and chromatic aberration effects, meets a camera module matched with a relatively long flange back focus, and can be widely applied to the optical lens industry. 本发明公开了一种长焦长法兰视频镜头，其特征在于，沿光线入射方向依次包括