During a recent investigation
Mike took the following photograph...
Now, in this context it's pretty
obvious as to what they are. These are what's known as 'lens
flare' and occur when a strong light enters the lens and reflects
on the internal lenses to create a second 'ghost image' of
the light source. Even if the photo itself does not contain
any intense light sources, stray light can still enter the
lens if it hits the front element.
The example above shows a lens
flare created by an internal, powerful lightbulb but this
is just one form. There is another type of lens flare that
is specific to the digital camera and occurs when the sun
is shining directly onto an unprotected lens. Even if the
sun is out of shot, if it is directly in front of the camera
a group of small rainbows or rainbow-coloured shapes can appear.
This type of lens flare is formed by an internal diffraction
on the image sensor and acks like a diffraction grating.
So when you're out taking photos
of an allegedly haunted location and a small rainbow-coloured
anomaly appears in the image always check as to where the
sun is in relation to the camera angle. If the sun was directly
in front then all you've captured is a digital camera specific