Europe pays more attention to anti-theft security (Diebstahlsicherung) , Topwelltechltd teaches you to buy security cameras

With the development of society and the improvement of the economic level, the safety quality （Sicherheitsqualität）of Germany in Europe has gradually improved. Frequently received questions such as "How to choose a surveillance camera" and "How to choose a home surveillance camera". Now that Topwelltechltd has concluded, I hope to help everyone.

The following summary considers mainly from the perspective of individual users, such as home, door, a yard, a shop, need to install video surveillance, how should we choose the right camera （Kamera）.

First of all, we should be clear, what is the purpose of our video surveillance installation? Afterwards, look for the video and find out the cause of the accident. It will help us to grasp the evidence and better handle the accident.

In summary, we should choose the surveillance camera from the following aspects:

Lens focal length

The lens of the camera is generally divided into fixed focus and zoom. We should choose the appropriate focal length lens according to the range and size of the scene to be monitored.

Generally fixed-focus lenses, mainly 2.8mm, 3.6mm, 4mm, 6mm, 8mm, 12mm, 16mm, 25mm and other such focal lengths.

The focal length of the lens is different, and the angle of view and range that can be monitored will be different. Below are some of the visible distances and ranges of common focal lengths that can be referenced when selecting a camera.

(1) 2.8mm, viewing angle 90 degrees, visual distance 5-6 meters

(2) 3.6mm, viewing angle 82 degrees, visible distance 6-8 meters

(3) 6mm, viewing angle 60 degrees, visible distance 10-15 meters

(4) 8mm, viewing angle 45 degrees, viewing distance 15-20 meters

(5) 12mm, viewing angle 30 degrees, visible distance 25-30 meters

(6) 16mm, viewing angle 22 degrees, visible distance 30-35 meters

The smaller the focal length of the lens, the larger the viewing angle of the monitor picture and the closer the visible distance. Visual distance Generally, we can multiply the focal length of the lens by 2, and then determine it by floating up a bit, such as 2.8*2=5.6, so the appropriate visual distance of the 2.8mm lens is about 5-6 meters.

Of course, the above is only a rough reference value, which is very helpful for the selection of the focal length of the surveillance camera lens in ordinary household or small monitoring projects. More accurate lens focal length, viewing angle, and viewing distance are also affected by many factors, such as the target surface of the lens, the measurement of the visible distance, and so on. Interested in reading these two products AI03 and AI04:

Now in the consumer smart home camera, we have a few more choices - panoramic camera. The panoramic camera uses a 180-degree, 360-degree panoramic lens, and a camera's viewing angle can reach 180 degrees and 360 degrees. In this way, in a small office, living room and other environments, an AI03 panoramic camera can be completely covered, ensuring that there is no dead angle in the monitoring.

The focal length of the panoramic lens is relatively small, such as 1.44mm, 1.1mm, the viewing distance is very short, so the best application scene of the panoramic camera is a room, such as the living room, meeting room and so on. 2. Choice of camera appearance

How to choose the appearance of the camera? Mainly depends on our installation location. This is very clear and well defined.

If we want to mount the camera on the wall, we usually choose the gun type MQ11 camera. If mounted on the ceiling, the hemisphere AI04 camera is generally selected. If it is an outdoor environment, we must pay attention to the need to be waterproof and dustproof. Pay attention to the IP protection level of the camera. For example, the camera with IP65 of MQ11 can meet the requirements of outdoor waterproof and dustproof.

In addition, with a suitable mounting bracket, the gun can also be mounted to the ceiling, and the dome can be fixed to the wall. The installation method is determined according to the site requirements, and it will not be discussed here.

In some outdoor wide surveillance scenes, we can choose a camera with a pan/tilt function so that it can be rotated 360 degrees. The same is true in the room. For example, we can put a small PTZ camera on the corner table, and when we remotely access it through the mobile phone, turn the pan/tilt to see the whole room.

3. Selection of camera functions

Choose cameras with different functions according to our monitoring needs.

Transmission mode, we can choose, video line transmission, network cable transmission, WiFi transmission, wireless AP transmission, 4G mobile network transmission and other different transmission modes of the camera. Most of the previous versions of the camera have been eliminated, and now generally use WIFI transmission.

Audio function, if we monitor the picture, we need to monitor the sound. Then we have to choose a camera with audio function.