What is a orb??
Orbs are somewhat tricky to figure out. Ghost orbs are thought to be the energy of those who have passed on many people believe they are the first stage of a full ghostly manifestation. They are the most commonly photographed form of ghosts and are quite common. They can appear as small, faint glows or bigger, solid balls of light.
Now 90% of the photos out there that are so called “orbs” are nothing more than dust, moisture and pollen and nothing paranormal.
The chart below is just a example of dust, moisture and pollen. Below is a collection of images that were put together counrsty of http://midnite-walkers.com
They also can appear in many different colors. Does this mean that the colors mean something? The answer is no. It is how the flash from the camera is bouncing off the dust and reflecting back to the camera.
Here is a photo of rain and dust.
Orbs in motion are sometimes mistaken for vortexes, camera straps and bugs. These are common photos or orbs in motion. They will leave a contrail behind them as they are moving. The tail end of them are some what transparent and the top part will be a solid color.
The following information is a good explaination on how “orbs” are photographed. This artical was taken from http://www.ghostgadgets.com/_knowledge/orbs.html
I want to emphasize the fact that orb-causing dust is floating in the air in front of the camera lens, and is not actually on the lens itself. It seems that many people think that wiping their lens clean before each photo session will solve the dust-orb problem, but this is entirely false. The truth is the dust is in the air, floating close to the camera lens (within about 6 inches normally), and there is no way to solve the problem through lens or site cleaning.
Some common characteristics of dust orbs in photographs may be showing some sort of nucleus, elongation around the central axis towards the edges of the photos, a rectangular or octagonal shape, but is not limited to these. Elongation around the central axis towards the edge of the photo is caused by a lens curvature error known as “Coma”, cameras with very small lenses and short focal lengths (such as digital cameras) are more prone to coma than other cameras with longer focal length lenses, such as SLR cameras. Orbs of a rectangular or octagonal shape are caused because of a phenomena that can be defined as “When an object with a similar shape as the aperture of the camera lens is brought out-of-focus, the object will begin to take the shape of the aperture”. In other words, if the aperture of the camera is an octagon (the aperture is the hole that opens to let light through the lens), an out-of-focus dust orb will begin to take the shape of an octagon, particularly towards the center of the image. Another common phenomena that is often mistaken for something paranormal is called lens “Flare”, and occurs when a bright light source (most often the Sun) reflects off a portion of the lens, and creates “ghost” images (not really ghosts, but internal reflections) of the aperture of the camera. Generally, flare can be ruled out of most photos taken at night, but can be a problem with shooting pictures during the day.
There is nothing paranormal about the dust orb phenomena, it is natural to any camera with a flash and any video with a light source that isn’t in front of the camera (ie, infrared light, spotlights). It seems that many groups still consider dust orb photos to be paranormal, because they don’t want to take the time to collect REAL anomalous data. What keeps these groups holding on to the dust orb as phenomena is the instant gratification they get by collecting hundreds of so-called “spirit orbs” in a single night of investigating. The truth is no matter what the environment, there are always air-born particles in the air (except in a vacuum…) that can contaminate your data. You can sometimes even see the flash reflect off the dust particles when a picture is taken. Also, this phenomena isn’t just limited to dust, it also applies to rain, water droplets, bugs, etc.