This may help some it was taken from,I hope it comes in handy

http://www.prairieghosts.com 

There are a number of different types of photographic anomalies that turn up on film during investigations. Many researchers believe that these types of activity portray actual ghosts, but I cautiously refer to it as "paranormal energy" on film, simply because there are so many unknown variables when it comes to paranormal photography. Some of the strange images on photos that turn up include eerie rays of light, floating objects, mists and shapes and even apparitions that appear to be human, but perhaps the most common images are the so-called “orbs�?

Many of the “orb photographs�?that turn up on Internet websites or in books seem to come from cemeteries but they actually seem to have an annoying habit of showing up almost anywhere. They have become the most commonly reported types of “paranormal photos�?claimed by ghost hunters today. Despite what you might see and hear though, there is absolutely no hard evidence whatsoever to suggest that orbs are in any way related to ghosts. Yes, they do often turn up in photos that are taken at haunted locations, but as you’ll soon see, many of these photos have been called into question. However, I do think that legitimate photos of image anomalies (or orbs, if you prefer) exist. These photos do show a type of paranormal phenomena, but just what type that is remains to be seen.

 One of the largest problems that exist with “orbs�?is that many researchers have made the leap to claim that “orbs�?are actually ghosts. To date however, there has been absolutely no evidence provided to state with any certainty that “orbs�?are actually ghosts. Some of them may be paranormal, but ghosts? There is no way that we can say that just yet.

As mentioned, orb photos are the most commonly seen "ghost photos" today and you will probably see more photos on the Internet of these purportedly "mysterious" balls of light than of anything else. While I do believe that genuine photographs of paranormal orbs exist, they are not as common as many people think. An "orb photograph" is usually one that is taken in an allegedly haunted place and somewhere within the photo is a hovering, round ball. Some of these “orbs�?appear to be giving off light, while others appear to be transparent.

Despite the claims, the majority of “orb photos�?are not paranormal at all, but merely refractions of light on the camera lens. This occurs when the camera flash bounces back from something reflective in the range of the camera. When this happens, it creates a perfectly round ball of light that appears to be within the parameters of the photo but is actually just an image on the lens itself. Many people often mistake these orbs for genuine evidence of ghosts. These false orbs can also be created by bright lights in an area where the photo is being taken, by angles of light and by many types of artificial lighting.

When looking at “orb�?photos, you will note that most of them occur when the camera flash is used. Some of the photographers will insist that their flash was not on, which means it was and they didn’t know it. The automatic exposure control on most any standard 35 mm camera uses fill flash in all but the brightest light. It should also be noted that “orbs�?were actually quite rare before digital cameras became common. In the early days of low-cost, cheap digital cameras, some “ghost hunters�?actually proposed that digital cameras are “superior for orb photography�? And since they were producing more “orb�?photos, this was technically true. But the digital imaging chip is very different than traditional film photography and was far inferior until recent times. Some of the earlier, low-end digital cameras were made with CMOS chips and they would create “noise�?in low-light photographs that would be mistaken for “orbs�? It seemed that when they were used in darkness, or near darkness, the resulting images were plagued with spots that appeared white or light colored and where the digital pixels had not all filled in. In this manner, the cameras were creating “orbs�? and they had no paranormal source at all.

If all of these problems exist with image anomalies --- “orbs�?--- then is there any reason to believe that they might be paranormal at all? I believe that there are legitimate photos of what are anomalous, round balls of light that can be photographed and can sometimes be seen with the naked eye. But how do we tell a real “orb�?photo from a false one? 

There are a number of determining factors, not the least of which is corresponding activity. By this I mean, photographing an “orb�?just after recording a sharp temperature drop, or some other event that can be documented. In every aspect of paranormal research, corresponding activity, and documentation of the activity, is vital to the success of the investigation and to authenticating the activity, evidence and especially the photographs.

                 SirMith