Introduction to orbs

Orbs are circles of light, generally varying between white and dull grey, that appear in some photographs. They became common with early digital cameras but are gradually becoming rarer as technology improves. Some people took orbs to be a paranormal phenomenon, particularly when they showed up in photos of haunted locations.

Although most serious paranormal researchers regard orbs as just photographic artifacts, interest remains high, particularly among the public and media. The situation isn't helped by the fact that several competing 'natural' theories for orbs (most with serious problems) have been proposed. Recently, the Orb Zone Theory, based on the explanation offered by camera manufacturers and serious photographers, has been applied successfully to the problem of orbs.

For more on paranormal photos in general, see here.