I have tried to photograph orbs in cemetaries but have never had any luck. My grandaughter went to Washington DC last spring with her 8th grade class. She took only disposable cameras & in photos of one building there are many orbs above the childrens heads.
I used to be very lucky at catching orbs on film. Now that I have started to learn more about photography and bought a better camera I can't think of one orb that I've seen in one of my pictures in a good few years. Go figure.