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Post by Darren on Aug 12, 2010 10:40:06 GMT 10
It is often perceived, especially on video, that orbs appear to travel through solid objects such as doors.
If orbs are circles of confusion - being out of focus particles or insects - they are only visible as "orbs" when they are within a certain range of the camera. This range is determined by the depth of field and is the distance between the lens to where objects begin to achieve focus.
When a particle (eg. dust) or an insect is in focus it is often too small to show up on a recording. Thus you can look at video of a door with a dust particle heading towards the camera and not see it. As the particle continues towards the camera it reaches the limit of focus and two things happen - light from the camera (eg. infrared) illuminates the particle and is reflected back and being out of focus an "orb" appears. This may look like an orb is emerging from the door but is in fact happening a few inches away from the lens.
In the following video at the 03:09 mark you'll see an example of this. An orb seems to come through the door in the middle of the screen and travel past the camera to the upper right, disappearing from view at about 03:20.
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