Imagine being able to insert your own image into other people's photos of your haunt! Put a ghost or deathmask on a tombstone!
The "Image Fulgurator" (I have no idea what the name means - it's German I think) is a clever way of inserting such images which will only show up on photos, but cannot be seen by the naked eye. It works best at night when flash pictures are taken, which means that it is perfect for haunted attractions!
Essentially, the Fulgurator uses a slave flash as a light source for a mini projector. A slave flash will activate when it senses the flash from a flash photograph. In this case, the slave flash will project an image onto a surface, and do it so fast that the human eye cannot see it.
But it will show up on the photo!
The inventor cleverly uses a film-style camera and film negative as the projector and slide. But you can use any projection equipment if you can replace the light source with a camera flash.
Check it out here: http://www.datenform.de/blog/2008/06/image-fulgurator.html
The video on this site takes a maddeningly long time to get to the payoff - skip forward to about the 2:08 point. Here a tourist notices that the picture he took has an additional image that he cannot see in real life.
Tags: Photo Ghost FX