Orb (optics)

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A single orb in the center of the photo, at the person's knee level.

The term orb describes unexpected, typically circular artifacts that occur in flash photography—sometimes with trails indicating motion—especially common with modern compact and ultra-compact digital cameras.

Orbs are also sometimes called backscatter, orb backscatter, or near-camera reflection.[citation needed]

Cause[edit]

Orb artifacts are captured during low-light instances where the camera's flash is used, such as at night or underwater—or where a bright light source is near the camera.[citation needed]

The artifacts are especially common with compact or ultra-compact cameras, where the short distance between the lens and the built-in flash decreases the angle of light reflection to the lens, directly illuminating the aspect of the particles facing the lens and increasing the camera's ability to capture the light reflected off normally sub-visible particles.[1]

The orb artifact can result from retroreflection of light off solid particles (e.g., dust, pollen), liquid particles (water droplets, especially rain) or other foreign material within the camera lens.[1]

The image artifacts usually appear as either white or semi-transparent circles, though may also occur with whole or partial color spectrums, purple fringing or other chromatic aberration. With rain droplets, an image may capture light passing through the droplet creating a small rainbow effect.[citation needed]

In underwater conditions, particles such as sand or small sea life close to the lens, invisible to the diver, reflect light from the flash causing the orb artifact in the image. A strobe flash, which distances the flash from the lens, eliminates the artifacts.[citation needed]

Below are two diagrams of a hypothetical underwater instance. In Diagram A, the faces of particles directly aligned with the camera's lens are illuminated by the flash, and thus the camera will more likely record orbs. In Diagram B, the faces of particles illuminated by the flash do not face the lens and therefore remain un-recorded. [2]

A hypothetical underwater instance with two conditions in which orbs are (A) likely or (B) unlikely, depending on whether the aspect of particles facing the lens are directly illuminated by the flash, as shown. Elements not shown to scale.

Example images[edit]

Examples of orb artifacts reflecting solid or liquid particles:

Paranormal interpretation[edit]

Consistent with pareidolia, Orb backscatter has been broadly interpreted as a highly variable range of supernatural paranormal phenomena without verifiability—including invisible spirits, unexpected lights, auras, angels, ghosts, energy fields, psycho-energetic artifacts, energy balls, etc.[3][4][5][6][7]

See also[edit]

References[edit]

  1. ^ a b "The Truth Behind 'Orbs'". 
  2. ^ Ledwith, Heinemann, Míċeál, Klaus (2007). "The Orb Project". Simon and Schuster. p. 208. ISBN 1582701822. 
  3. ^ "Enough with the Orbs Already,Stephen Wagner". About.com. 
  4. ^ "A Life in the Day Klaus Heinemann". The Times (London). 31 August 2008. 
  5. ^ "Orb FAQ genuine paranormal orbs ASSAP". Assap.org. Retrieved 2014-01-21. 
  6. ^ "Antique orb". Paranormal.about.com. 2013-12-19. Retrieved 2014-01-21. 
  7. ^ Ledwith, Heinemann, Míċeál, Klaus (2007). "The Orb Project". Simon and Schuster. p. 208. ISBN 1582701822. 

External links[edit]