Hi Clarissa:
To be honest, opinions on orbs vary a lot from person to person. The main thing I have learned form taking and looking at pics, is this:
Most "spirit" orbs have substance to them, as opposed to dull, gray, filmy looking.
Orbs which illuminate on their own, give off their own "aura," without the benefit of a flash or other lighting close by, could be spirit orbs.
Orbs which are moving, and you can tell that the orb is moving, by a "trail" or "aura" showing the movement. Orbs which move with "purpose" as if they have something in mind are good candidates for being "spirit" orbs. I saw one on one of the Ghost Hunter episodes, which distinctly moved in certain directions, as opposed to being caught up in the airflow of the building. When looking at pics, you have to make sure the background and surroundings are not blurred so that the movement of the orb, cannot be attributed to the movement of the camera. Dusties move also, due to airflow or whatever; but, they normally don't produce an aura or trail of light. Insects can also produce their own light or have an irridesence to them and appear to be a spirit orb.
The weather, time of year, etc... can also be used to determine if an orb is possibly an insect or moisture. Moisture droplets can also be mistaken for orbs, since any small amount of light can cause them to illuminate, and if they're sprinkles of rain or snow, you will also see movement.
I hesitate many times, even saying if a pic is a spirit orb or not. When I go out taking pics, I also rely on "feelings" I get at a location. Sometimes I will get a feeling and snap a pic, and yep there it is. I recently had a feeling in St Peters Cemetery in Philly, and as I looked through my viewfinder, I actually saw an orb moving towards me deliberately. I snapped the pic and will be sharing it soon. This is a well-documented haunted location, so I'm fairly confident in saying the orbs I photographed there were most likely spirit orbs. Location also plays a part when trying to capture PN pics.
Orbs are balls of energy, so it makes sense that they would emit their own light. There are other forms of energy all around us in the atmosphere, so no one can really say for certain, what is producing some orbs. It's a mystery, and I guess that's what keeps us PN peeps, forever searching for the answers.
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