system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some cameras flash multiple times before taking a picture?
gpt
Cameras usually do this in low light. If the scene is rather dark, the autofocus system of the camera cannot see where to focus. By emitting a series of flashes, the autofocus system gets the information it needs to focus, and when it is done, the camera takes the actual picture, accompanied by a flash as well.