一、镜头毫米数是什么意思呢？
1、 What does the lens millimeter number mean?
通常我们说的监控摄像头镜头毫米数是指的镜头焦距，指平行光入射时从透镜光心到光聚集之焦点的距离。镜头焦距的长短决定着拍摄的成像大小、视场角大小、景深大小和画面的透视强弱。不同的焦距对应不同的成像范围钢制闸门 钢坝 保定轻钢别墅 保定平面设计培训 保定室内设计培训 保定办公家具 保定空调维修
Generally, the millimeter number of surveillance camera lens refers to the lens focal length, which refers to the distance from the optical center of the lens to the focus of light aggregation when parallel light is incident. The length of lens focal length determines the imaging size, field angle, depth of field and perspective of the picture. Different focal lengths correspond to different imaging ranges
二、摄像头镜头选择：是根据监控摄像头监控距离的远近，和监控范围的大小来决定的。监控摄像头镜头的选择，毫米数越小，那么监控画面的角度就越大，但是最清晰的距离就越近；反之，摄像头的镜头毫米数越大，那么监控画面的角度就越小，但是最清晰的距离就越远。
2、 Camera lens selection: it is determined according to the monitoring distance of the monitoring camera and the size of the monitoring range. For the selection of surveillance camera lens, the smaller the number of millimeters, the larger the angle of the surveillance picture, but the closer the clearest distance; On the contrary, the larger the number of mm of the camera lens, the smaller the angle of the monitoring picture, but the farther the clearest distance is.
三、通过一下三种角度选择
3、 Choose from the following three angles