Well, if such a phenomenon is real:
QUOTE (MasterPo @ Dec 27 2007, 03:33 PM)

One theory is that, somehow, ghosts (especially shadows), can control their light in such away that renders them invisible on film or digital.
Light is light though isn't it? I really don't see how light can be changed somehow to be visible to a camera and not the human eye. I guess it could be a different wavelength. But I would think a a camera would be designed to pick up the same range as a human eye. I'd like ideas about this in more detail.
QUOTE (MasterPo @ Dec 27 2007, 03:33 PM)

Another theory is that a ghost can make itself visible to a specific person only. IOW, the image you see is for youself only, not for others too see.
Yeah, that makes sense. But it doesn't explain how.
QUOTE (MasterPo @ Dec 27 2007, 03:33 PM)

There's a theory that ghosts interact with our minds on a more telepathic level so when we think we "see" a ghost it's really an image in our minds and not a real image of light.
That makes the most sense to me. I definitely think the psychological angle makes sense.
QUOTE (MasterPo @ Dec 27 2007, 03:33 PM)

And there is a theory that ghosts move extremely FAST through our reality so it's hard for normal cameras to capture them.
Which would make sense. It's true that if something is moving fast enough, a camera wont be able to record it. But then, if something was travelling that fast, would people notice it?
QUOTE (MasterPo @ Dec 27 2007, 03:33 PM)

All in all it may be similar to how EVPs are formed and that you can't hear an EVP without the "E" part.
Isn't that circular logic? It's picked up electronically because it is picked up electronically? Doesn't make sense.
QUOTE (Mabon @ Dec 27 2007, 10:37 PM)

I often wondered if people who don't see ghosts but the ghost show up on film or digital footage actually induce a sort of self blindness. This kind of popped in my head one night when I was talking with my spouse after watching an episode of Ghost Hunters. Well... the question was asked by him, 'why do they show up on camera but not to the naked eye, especially if the person is looking right at the spot?' I thought about it for a while and said that a camera captures what's there not what is perceived to be there. Without going into the whole how eyes perceive images (which can be googled or looked up elsewhere) one of the factors is that humans can look straight at something and if it causes them distress not see it. Ghosts/spirits would/could be considered disturbing to some so perhaps they 'blank' them out of their minds eye.
That's pretty interesting. I've held the exact same theory for a while now.