When we purchase surveillance cameras, we know that the purchase monitoring is related to the number of millimeters of the lens, depending on the needs. There are more 6 mm 4 mm lenses for normal use.
Many unprofessional installation companies buy a camera and only buy two lenses, a 4 mm and a 6 mm. If you take these two lenses for replacement, which one is better, which kind of lens is used. No problem, but it seems to be particularly unprofessional.
Let's take a look at the relationship between the camera lens millimeter and the illumination range:
From these reference technology pictures, we can see that the smaller the millimeter of the camera lens, the larger the angle of the monitor image, but the closer the sharpest distance is; on the contrary, the larger the millimeter of the camera lens, the more the monitor The smaller the angle of the picture, the farther the clearest distance is.
Below we list some of the commonly used places to choose the camera how to choose the number of millimeters of the lens?
In indoor environments such as small shops and homes, 4mm lenses are recommended, mainly considering that the indoor distance is not too far (3-6 meters), and the angle of monitoring is large enough. Looking at the cell unit door, we generally choose a 6mm lens so that you can see the unit door and the entrance and exit of the unit door. On the outdoor road, Hu equivalent scene, you can choose 6mm or 8mm camera (the ideal monitoring distance is 10-20 meters), with corridor mode to make the picture more perfect.
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