Ok - Kortoso my mistake. Very interesting. Can you explain in some detail what occured? Where you were, time of day/night, and where was the orb; in the sky, a house, forest, etc.
I've got evidence of orbs on my digital camera. My camera is a new Nikon CoolPix right out of the box. I never experienced this with a 35mm. As mentioned earlier this is subjective.
I was living at a friend's house temporarily. He and his wife took off one evening and I decided to stay home.
At one point that night, I had the feeling that someone was in the yard, so out I came, broadsword in my fist. Nobody seemed to be there, but I got a prickly sensation that I wasn't alone. Waldgeist, I am sure you recognize it.
Then I saw a light in the middle of the yard.
At first I thought it was a nearby streetlight, glimpsed through the trees. Until I walked around it! As the hairs of my head stood each upon it particular end, I quickly decided I should be indoors with all lights on.
My friend came home soon and announced cheerfully, "So, you've seen our ghost!"
To this day, I visit old houses and such and recognize that prickly feeling, and know a haunting when I feel it.