Photographic questions (about multiple exposures) Please see my detailed questions (yes).

Multiple exposure, as the name implies, is to repeatedly expose the photosensitive medium by opening the shutter for many times, thus producing special visual effects.

In the era of film cameras, some cameras have multiple exposure functions. First cover half the lens to take pictures, and then cover the other half to take pictures. If you develop it, you can get twin photos of people who appear twice in the photo. A special turning frame is installed in front of the lens to cover it. As long as the camera is fixed with a tripod, the light conditions will not change when shooting twice.

You can look at your operation again. Photography is mysterious.