The camera lens is the eye of the camera and is an indispensable part of obtaining high-definition images. Whether the coordination of the surveillance camera and the lens is reasonable will directly affect the overall effect of the entire monitoring system. Considering the importance of the lens, if you want the lens to perform its imaging, you must fully understand the type of lens, including the application of the lens, and understand the matching characteristics of the lens. Only you can fully understand the characteristics of the lens and The application can fully utilize the imaging effect of the lens.
At present, the classification of domestic surveillance lenses can be roughly divided into fixed aperture lens, manual aperture lens, manual aperture zoom lens, auto iris lens, auto iris lens, auto iris zoom lens, trigger lens, fisheye panoramic lens, and power zoom. Lens and so on. The main difference between the lenses is the use of the lens and the application environment. Therefore, how to use the lens imaging effect in practical applications has become a major factor considered by the engineering company.
Common faults in surveillance camera lenses:
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1. The camera and lens interface do not match.
The mismatch between the camera and the lens interface will directly affect the distance from the second set of points of the lens to the camera chip. The actual lens focal length is not the nominal focal length, which will cause the lens to be out of focus.
2, the camera and lens imaging size does not match
We know that only when the imaging size of the lens is larger than the size of the movement, it can be imaged normally, but the angle of view of the lens will be smaller than the nominal angle of view; if the size of the lens is smaller than the size of the camera chip, a vignetting will appear around the monitor screen.
3, the camera and lens aperture work drive mode or voltage does not match
Auto iris lenses are generally divided into video drive and DC drive, and their working voltages are not exactly the same. The voltage mismatch and drive mismatch will cause the lens aperture to not open normally, and naturally it will not be able to image. Here to remind everyone, when using the auto iris lens, you should first put the aperture converter on the camera to the nominal drive mode of the lens, and ensure that the output voltage of the camera is within the working voltage of the aperture.
4, connection problems, misconnection or loose interface
There are various connections when the surveillance camera is connected to the lens and the display, and when there is a connection between the camera and the controller, there will be more connections in the middle. If the connection is not careful enough, or If the connector is not connected loosely, it will also cause the system to not work properly. Therefore, when the construction personnel are required to install, be sure to read the installation instruction manual carefully to avoid such a situation.
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