Spirit Photography

Spirit Photography dates back to the 19th century and is used to try and capture ghosts on camera. William H. Mumler used it in the 1860's when he accidentally used a double exposure. He started selling double exposed images, to add the images of dead loved ones to the picture. He was soon discovered as a fraud.
Nowadays, spirit photography has a whole new meaning. Many people capture orbs on their cameras, which many claim are spirits. Others argue that they are in fact just dust particles. What do you believe?
Comment if you have ever captured a ghost on camera.