When we look at something with our two eyes, we see in three dimensions because our brain interprets depth by comparing the two images from the left and right eyes. To simulate this photographically we need two photos of the same scene, taken from slightly different positions. This can be done using two cameras mounted together, or a multi-lens camera designed for stereo photography, but can also be done with just one camera - even the most basic type. Its simply a matter of taking one photo, moving the camera to one side, then taking another photo. Same scene, slightly different viewpoint.
taken from graham's 3D Photography guide
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