I just thought I would share a few of my orb pictures that I have captured over the years. All the pictures have been zoomed in and as you can see they are not all the same. I agree that many orbs caught on tape are simply dust or moisture particles however I have seen many with the naked eye so in my experience, I never discount any orbs in pictures. I find the best practice is to run dust tests in situations where you are capturing a lot of this type of phenomena. Sometimes you may be surprised by the results.
I guess, by definition, an orb is a UFO….An orb doesnt have to be in the sky to be classed as an unidentified flying object.