Now more and more companies and individuals have to install cameras, but when you go online to buy or go to the supplier to choose, you find that the price of each family is similar, the camera specifications are many, what camera is what we should buy? ? Below is a well-known domestic camera manufacturer Harmony Guardian teaches you how to choose a surveillance camera.
Camera clarity selection
The clarity of the camera, the general civilian level is 420 lines, 480 lines 520 lines, 600 lines, 700 lines mostly, the more lines, the clearer. The number of lines represents the sharpness of the camera, ie the number of lines scanned horizontally on the monitor. Generally, more than 600 lines are represented as HD cameras. There are a lot of virtual standards in the market. Some of them have 700 lines. Actually, there are only 500 lines. There are many differences. We often have actual tests. The appearance of a normal TV face can be seen.
Camera appearance
The difference in shape is divided into a dome camera and a gun camera. The hemisphere type is named for the shape, and has the advantages of small size and beautiful appearance. It is suitable for installation code in indoors, offices, hotel corridors, elevators, corridors, etc., and has good concealment. The hemispherical focal length is not large and is suitable for objects close to the place. The gun camera is suitable for installation in all locations, and there is no specific difference from the hemisphere. Other special-shaped cameras (such as flying butterfly, smoke, pinhole, and smoke) are suitable for places with special requirements in the room.
Camera lens differentiation
Generally, 3.6MM and 4MM are wide-angle lenses, that is, the range of the photos is relatively wide, that is, the range of the horizontal faces is relatively large, but the distance is pulled away, and the people become smaller. Of course, things will become smaller and smaller. It is suitable for the storefront or family door, that is, when the object is 3-5 meters away.
6MM/8MM/12MM is the distance pulled in, the orientation is smaller, just the opposite of the two millimeters above, the distant things can be monitored and zoomed in, the distance of the horizontal surface will be smaller, suitable for a wide area. Such as parking lots, workshops and the like. For details, please refer to the following figure:
Camera interface selection
Nowadays, the cameras on the market are generally BNC connectors. Recently, the network interface and RJ45 interface have been popular. They are transmitted through the network cable and belong to the ultra high definition camera, but the price is higher.
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