eimeard07 wrote: what does it mean if you take a couple of pics of the same spot
I think what he was meaning, was if you take several pictures of the same location. Maybe if different angles. It may help you determine if its dust, lens flare, orbs, or something else.
However, if its dust, it would likely show up in multiple pictures. Unless you give it a chance to settle down without moving. I find that dust is very visible on an IR camcorder with a strong IR source usually.