Monitoring camera 6mm 8mm 12mm 16mm length and width can be according to how much.
3.6MM10-20 meters 6MM20--35 meters 8MM30--50 meters 12MM40--60 meters 16MM50--70 meters General project is: the target in the display device is greater than or equal to 1/6 of the area, you can see the target.
According to the imaging principle, the smaller the focal length, the wider the field of view, but the distance is not clear. The larger the focal length, the narrower the field of view, but the longer the distance will be clearer.
At the same time, the same focal length, length and width shooting range also with the camera CCD has a relationship. Charge - coupled Device, Charge - coupled Device. It is a semiconductor device that converts optical images into electrical signals. At present, most of the CCD chip used in the surveillance camera is 1/3 "and 1/4", that is, the target size is 1/3 inch and 1/4 inch. CCD target surface size, CCD and lens with the situation will directly affect the size of the field of view and image clarity.
