I think it's common knowledge that spirits will come through as orbs in a photograph. At least, that's what investigators of the paranormal will tell you. Yet, it's so in the realm of possibility that a camera will catch dust and it will show up as an orb.
I'm with you. I like stuff like this, but you also leave yourself open to evil spirits if you ignorantly go into the subject. I believe in evil spirits, too, so I don't want to get involved too deeply. I've heard parapsychologist say that they have to pray or whatever it is they do, to protect themselves from them.
Contrary to what you like, I don't like ANY activity in MY house!

I've had it, though. Usually child/immature spirits, thank God! My husband was also aware of them at the same time I was, so I know I wasn't dreaming or hallucinating!
When I was a child, a whole carful of us saw my dad's spirit at the same time. When the evil grandmother died, my oldest son saw her sitting where she usually sat in my front room. He was three at the time. I definitely felt the cold spot! I made her leave, but she will still haunt me from time to time. (shivers!!!!) Hubby says maybe she's looking for forgiveness. Maybe... but not in THIS lifetime!! eewwwwwww!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.