Orbs are the worst kind of ghost photograph, and the ones that are most easily explained. The best explaination of orbs came from Chicago’s Ghost Research Society.
Orbs! The name conjures up little balls of white light. Most orb photographs are taken with digital cameras under extremely low-light conditions and are nothing more than digital flaws caused by lack of pixilation or filling of the proper colors due to a digital defect. I have viewed thousands of such pictures and they are nothing paranormal, especially when taken with older digital cameras. Solution: always use another camera in conjunction with any digital camera especially under low-light conditions. Those not taken with digital cameras could be moisture droplets in the air illuminated by the flash unit, rain, blowing dust, snow or sometimes even small insects. Please be aware of the weather conditions under which you take your photographs.
I had a friend who used to say she was the orb master photographer. She caught these orbs like crazy! Surely she was a some sort of medium for ghosts. Now, this person is a very nice and pleasant person, but a little naive. “What kind of camera do you use?” I asked her once. “A digital.” she replied. “It’s kind of old, but it does what it’s supposed to do.” 
