Can the laser night vision PTZ camera capture images in the dark ten meters away?

Today, a netizen asked Ah Qiang, a technician of WorldCom Bell, who stood in front of the window at more than 12:00 pm and saw 3 or 4 flashes outside the house opposite the door. Was he secretly photographed? If the light is not on, can the laser night vision PTZ camera take pictures in the dark ten meters away? A Qiang said that it is possible, depending on what type of camera the other party uses, there are several types of optical cameras, including forest fire cameras, coastal defense surveillance cameras, border defense surveillance cameras, water quality monitoring cameras, disaster landslide cameras, city lookout cameras, AI intelligent cameras, laser night vision PTZ cameras, thermal imaging PTZ cameras, visible PTZ cameras, dual spectrum PTZ cameras, Multispectral PTZ camera, spherical turntable camera and other cameras have a shooting distance of more than 10 meters.

Some cameras have a shooting distance of up to 100 meters, so it is easy to be secretly photographed at a distance of 10 meters away. If the people who will use them shoot things in the dark at night, they will turn up the sensitivity rather than flash, and the flash distance of 10 meters from the mobile phone can be ignored. If the SLR is flashed externally, the brightness will be much higher than the mobile phone, which can be distinguished by a moment. I guess what you see is the flash flash effect of someone else's call, Now let me give you some knowledge about the corresponding distance of camera focus.

1、 Meaning of camera focus

In short, it is the distance between the lens and the sensor. It can be indicated by the English letter f. Generally speaking, the magnification of the lens and the size of the captured image are proportional to the focal length of the lens. When we need to photograph distant objects. It is necessary to increase the focal length of the lens and bring the distant view closer, so that the details of the distant view can be seen more clearly. If you need to shoot a wide range of scenes, you need to reduce the focus of the lens.

2、 Corresponding distance of camera focal length

The corresponding distance of f2.8mm is 1-3m

The corresponding distance of f3.6mm is 2-4m

The corresponding distance of f4mm is 3-6m

The corresponding distance of f6mm is 5-10m

The corresponding distance of f8mm is 7-15m

The corresponding distance of f12mm is 10-20m

The corresponding distance of f16mm is 20-30m

The corresponding distance of f25mm is 25-35m

The corresponding distance of f60mm is 50-70m