One of the biggest types of ghost pictures always seems to be of 'orbs' or 'wisps' and I can't understand why. I was taking some pictures of an old cabin for a friend who was documenting the cabin before he sold it and I found tons of orbs in pictures. I know it wasn’t because it was raining or wet because it was dry outside. I know it wasn’t because of the sun in anyway because the sun had almost completely set but was not visible to me while taking the pictures. I know it couldn’t be dust either because I had taken a great deal of time to clean the camera prior to use. Even though all these things are true it didn’t stop me from seeing orb like things on my pictures. To me I believe it must have been a flash reflection from the windows in the cabin. I did however find this website that is based on debunking 'orbs' I found this website while browsing some forums and a user had linked this website.
http://www.prairieghosts.com/trouble.html