Photography has been exposed for a long time. Why is there no one in the photo?

Long exposure is related to the aperture of the shutter. Generally, it takes a long time to expose in the dark. Because the light is dim, it takes a little more time to make the camera fully sensitive. If the light is moderate or sufficient, you will still be exposed for a long time, and the picture will only be white, nothing, and overexposed.

The camera imitates the principle of human eyes, just like you see things in a bad light environment, so you need to look carefully. Stare for a while before you can see clearly. When you switch to the camera, you must enlarge the aperture (open your eyes) and reduce the shutter speed (blink speed). In the case of sufficient light, on the contrary, this is the basic imaging principle of the camera.