What happens if there is a camera in a closed box made of mirrors and the flash is turned on? All black? All white? Or can shoot.

You asked a very interesting question. My answer is:

1. Today's SLR digital cameras have strong photometry ability, which can completely complete photometry in the dark to ensure correct exposure.

2. When shooting with a flash, if it is completely dark, the camera or flash will send out a beam of auxiliary light for photometry in advance to measure the scene, and then control the amount of flash when shooting according to the photometry result.

3. Today's high-end SLR cameras can completely perceive the amount of reflected light around and the mirror when taking pictures in front of the mirror, and can accurately complete metering.

4. So, when you put the camera in your environment, you can take a completely normal picture, not a piece of white, not a piece of black. Of course, mirror spots will be photographed, and these spots can be minimized by increasing or decreasing exposure. In addition, if the cameras used are of different grades, there will be many differences in the photos taken, and some cameras may be whiter, which can also be improved by changing exposure. You can look in the mirror in the dark room at night.