This technique involves using a purchased or constructed slide bar and a single camera to make both exposures. You can build one yourself by using an aluminum plate with the edges folded to make a support against which the camera can rest, with a ruler glued to the back to determine the amount of image separation.
The drawback to this technique is that the subject must be stationary between the two exposures. In spite of this, numerous successful landscape stereo pairs have been taken this way.
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