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How to choose security camera lens?

Monitoring the lens of the Network Camera is an important device for monitoring the system. On the one hand, his quality can affect the parameters of the entire camera. On the other hand, whether the matching of the camera is appropriate or not is directly related to the overall effect of the monitoring system.
Usually go to the situation, the lens of the surveillance camera does not need our own adjustment, we choose to choose 4mm, 6mm or 8mm lens on it.
Let's take a look at the common sense of webcam lenses today and how many millimeters we choose.
Now the network camera megapixel camera, the common one has 1 million pixels, 1.3 million pixels, 2 million pixels, 3 million pixels, 5 million pixels. Some high-end manufacturers have done 10 million pixels.
Our usual users can use less than 2 million pixels, and several aspects that determine the clarity of the lens include:
Monitor the material and purity of the lens: There are fewer impurities in the material and the purity is high. From the optical point of view, there is less interference light.
Monitor the accuracy of the lens grinding: This accuracy is determined by mechanical grinding equipment, the difference between the domestic lens and foreign big-name lens is at this point.
The accuracy of the monitoring lens coating: The coating process is an important process for monitoring the lens manufacturing. Accurate control of the coating is also one of the decisive factors of the lens definition.
When we match, we should choose the function of the lens product according to the scope of application of the camera. If the network camera needs to be equipped with an infrared light when it is in use, it is necessary to select an IR-capable lens so that brighter and clearer images can be obtained even at night.

The other is when the lens selection must pay attention to the use of the site, what kind of lens is needed, what kind of lens to match.
The general lens size is most closely related to the monitoring angle and monitoring distance. The specific lens selection table below is used.

Through the above table, we can see the relationship between these parameters, the following is a schematic diagram of the selection of the lens.

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