People make a really big deal about orbs. Layfolk, I'm talking about those circular/spherical globules and balls that show up in photos.
To be honest and sorry to play the skeptic, but I'm ambivalent about most orb photos mainly because they're so open to debate. I mean, whether it's a 35mm film or digicam, so many things can affect them: dust, moisture, bugs, etc. And to me, digicams pick all of those things up even more. You have to be really careful about looking at orb photos and saying "Ghost!" because it--more likely than not--isn't.
Now...how do you know when it isn't? Hard to say. It's like porn: you just "know it when you see it." If you could actually see that it wasn't a bug and dust wasn't on your lens or all stirred up, it moved in a different way than dust or bugs then... No, really. You have to examine the negative and take into account your film and photography conditions. For a digicam, it's more up in the air because it is what it is. See why orb photos make me think twice about them? Too many X factors involved. Shouldn't stop you from taking pics though. I'll be the first to admit that I'm not the most enthusiastic person when it comes to taking ghost photos sometimes.
I dunno. Give me a good "mist" or shadow or holy grail--apparition--photo anyday. I'm just not feeling orb photos right now. If anyone has any better criteria, hey, I'm open. Let me know.