Security lens, also known as CCTV lens, is used to match the camera in the security system. It is an eye in the security industry. Without this eye, we can't see it. Therefore, the main function of monitoring is to collect the reflected light of the photographed object and focus it on the CCD. The image projected on the CCD is inverted, and the camera circuit has the function of reversing it, Its imaging principle is the same as that of human eyes. At present, the brands in the industry mainly includeYTOT lens,SECULENS lens, Computar lens, fujineng lens, etc. for such important equipment, how to select it is more important, because it directly affects whether the effect of the monitored picture seen on the monitor at the end of the system after the system is composed can meet the design requirements of the system (in terms of actual use or image details). What should we pay attention to?

The following is about how to correctly select the camera lens according to the different use environment.

1. Selection of Auto iris lens & Manual iris lens 

The selection of Auto iris lens & Manual iris lens depends on whether the illumination of the use environment is constant.

When the ambient illumination is constant, such as in the elevator car, in the closed corridor and in the room without direct sunlight, the manual aperture lens can be selected. In this way, the aperture size of the lens can be adjusted at one time according to the actual illumination of the environment during the initial installation and commissioning of the system to obtain a satisfactory brightness picture.

For the situation that the environmental illuminance changes frequently, such as the lobby, window and lobby where the illuminance changes greatly with the sunshine time, it is necessary to select the automatic aperture lens (the camera with the automatic aperture lens socket must be equipped), so as to realize the automatic adjustment of the picture brightness and obtain a good monitoring picture with relatively constant brightness.

The control signal of automatic aperture lens can be divided into DC and video control, namely DC voltage control and video signal control. In terms of the type selection of automatic aperture lens, the connection mode of camera automatic aperture lens socket and the driving mode switch of automatic aperture lens, the three should be well coordinated.

SECULENS  produces ,good quality and good price. You can find the lens products you need in our website product catalog and contact us to get the CCTV lens price you want!

Now you know how to choose manual focus lens and electric focus lens. Do you know how to choose fixed focus lens (M12) and zoom lens? We will give you a detailed introduction. Click 【Selection of fixed focus and zoom lens】