Technically, the Image Fulgurator works like a classical camera, though in reverse. In a normal camera, the light reflected from an object is projected via the lens onto the film. In the Image Fulgurator, this process is exactly the opposite: instead of an unexposed film, an exposed and developed roll of slide film is loaded into the camera and behind it, a flash. When the flash goes off, the image is projected from the film via the lens onto the object.

Due to the similarity of the two processes, the Fulgurator looks like a conventional reflex camera. As soon as the built-in sensor registers a flash somewhere nearby, the flash projection is triggered. Hence the projection can be synchronized to the exact moment of exposure of all other cameras in its immediate vicinity. Via a screen (ground glass), it is possible to focus the projection and to position it on the targeted object.