Photojojo shows you how to make your own 3D camera for less than $15 and enter the fabulous world of the 3rd Dimension, all need just two disposable cameras and some duct tape.
Step 1: Turn one of the cameras upside down to get the two lenses as close together as possible (lenses aren't usually located in the center of the camera). Line the cameras up so the lenses are on the same level.
Step 2: Tape the cameras together with duct tape. Don't cover up the shutter buttons or winding mechanisms.
Step 3: Go out and shoot! To take a picture, press both shutter buttons at the same time.
Step 4: Just have fun and accept that this method won't give you pro results.
Since the lenses are about 4 inches apart and human eyes are usually 2.5 to 3 inches apart, the 3D effect won't be perfect. And besides, it's a disposable camera, so treat it as a toy and just have a good time.
mais em : http://photojojo.com/content/tutorials/3d-stereo-photography/