I suppose this has been discussed before on this very long thread? But I rather feel that even if ghosts exist (which ok they might) then it's another thing entirely to expect them to be caught on camera. Then they'd have to have substance you could bounce photons off. And maybe they're not like that, maybe they're kind of hallucinations happening directly in a person's brain in response to Something Peculiar in the environment?? More like ESP. So that would discount every single photo ever taken. Which would be a shame. But it wouldn't surprise me when they're generally resolutely crap. (That ridiculous one with the holey sheet face at the altar though, I'll never get over that one).