(often stereo photography), n.A technique for using two photographs to produce an image with the appearance of three dimensions.
NotesThe two photographs in a stereoscopic photograph are made simultaneously using two cameras (or a specialized camera with two lenses) roughly 2½ inches apart. This separation is roughly the distance between the human eyes. The images are typically viewed using a device that displays the left image to the left eye, and the right image to the right eye. Stereoscopic photographs made using daguerreotypes date to the beginning of photography; pairs of stereoscopic prints on cards (stereographs) were popular from the 1850s through the 1910s; and stereoscopic transparencies made using 35 mm film were made as early as the 1920s and popularized with Kodak's Stereo Realist camera in the 1940s.