The next step up from 3D with a single non-stereo camera uses two identical cameras mounted on a firm support such as a bar, and some means of synchronizing the shutters on the two cameras.
Because of the size (width) of most cameras, the resulting lens-to-lens separation (stereo base) is more than normal, resulting in a slightly hyperstereo image. Thus this method is not generally good for close-up photos.
Here are some articles on twin-camera stereo. The first two, based on the Nikon Lite-Touch, were written by Ed Comer. The first describes Ed's first twin camera project, the second how he improved it. The third article was written by Jim Norman and describes his Canon EOS Rebel X twin rig with linked zoom lenses.
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