Manual Iris & Auto-iris Lens
How to choose a manual iris or autoiris CCTV camera lens? It depends on the illumination of the camera operation environmental. In a constant stable illumination environmental conditions, such as elevator, corridor, closed room without direct sunlight, you can choose the manual iris lens, you can adjust the manual iris to get the best quality picture for the fist time to install CCTV system.
Others, if the environmental illumination is constantly changing by circumstances, such as the lobby, hall, window, the illumination changed greatly by the sunshine。In such condition, you are required to choose the auto iris lens ( this camera must be matched with an auto iris socket ), so that we can realize automtic regulation for the brighness. For the auto iris will obtain a relatively good quality image.
For the auto iris lens control signals can be classified into DC and Video control. As namely it is the DC voltage control and video signal control.
Connection for the auto-iris lens socket, auto-iris driving mode switch is the most important element for an auto iris CCTV camera.
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