My TDC Colorist stereoscopic camera. TDC stands for Three Dimension Corporation. It was a division of Bell and Howell, but the camera and its excellent lenses were manufactured in Germany.

Here is a picture of a section of slide film as it appears before it is sliced into individual chips. The photo shows how the two lenses exposes the pairs of images, left and right, read from right to left as it passes through the camera. Every two exposures is the left-side image of the next pair, followed by the right-side image from three images before.

Here is a picture of the cut chips, paired up and ready to mount in the 2” x 4” mounts. The finished mounted slide is viewed using a hand-held device that can be as simple as something you hold up to the light or as complex as an electrically-lighted, rheostat-controlled, interocular adjustable, focusing viewer. Nothing else in photography compares to the experience of viewing the vivid three dimensional image through one of these viewers. It is really like being there.

On the left is an image of the final mounted stereo slide. The slide film is held in place in the mount by either glue (in the case of heat-sealed mounts), tension (in the case of slip-in mounts, where the film sits in a tight slit in the cardboard) or by nipples that fit in the sprocket holes (or perforations) of the film chip. On the right is a Kodaslide II stereo viewer, manufactured from 1954 into the 1960s. The little handle on the top above the lenses is the interocular adjuster, which, when it is moved left or right, points the lenses slightly in or out to accommodate people whose eyes are closer together or farther apart.