MAKE YOUR OWN STEREO PICTURES
DIRECT VISION STEREO
Since the inception of stereo photography, there has always been the hope that some day depth could be seen by anybody without using polarized glasses or a stereoscope. The dream of having a single print or transparency which can be placed in a show-window for every passerby to see in true color, in depth, has always been most
impelling. And there has been a tremendous amount of work done in this direction.
FIG. 4. LENTIC MULTI-LENS CAMERA
Courtesy of Lentic Corporation
Just a short time ago, a new camera to make use of the lenticular process was offered to the amateur for his use in presenting three dimensions without
use of optical aids.
The Lentic three-dimensional camera, made in England and imported by the Lentic Corporation in New York,
WHAT IS STEREO PHOTOGRAPHY?
employs six lenses, coupled, and uses 120 size film.
Pictures may be enlarged by means of a special enlarger designed just for this camera. See Fig. 4.
The camera is synchronized for flash and has a rangefinder; the six shutters' speed can be set at any point from Time to l/100th of a second. Either prints or transparencies can be made, and after the pictures have been taken the reel can be sent to the company for processing.
The processing is a complex procedure, a group of images being impressed upon a screen called a grid or lenticular screen and which is similar to corrugated board. These corrugations are very tiny and act as separators—the left side of each presenting an image for the left eye, while the right side of each supplies the right eye's image. Lamination of the various views of the scene or subject received by the six lenses on this lenticular screen gives a rudimentary impression of depth.
This new camera, in contrast to others used to produce this type of stereo, is portable and designed for amateur use. The other cameras, made for professionals, generally move about the scene or the subject in an arc in order to secure the several views required for imposing upon the grids.
The Bry Color Laboratories of Chicago, Illinois, are now producing what they call "Becker Stereo Prints" which are made from a stereo pair of color transparencies. This stereo color print is made in size 25/8
x 33/8 inches and can be seen in three dimensions without optical aids. Only good quality transparencies can be used to make these prints; they must be correctly exposed, in good focus and have good color balance. They must also have been made in close conformance with rules and procedures governing stereo techniques.
Of course, the stereoscopic quality of the resulting direct-vision stereo print and transparency depends greatly on the number of views of the subject that have been made and laminated together. The best of these pictures are the multiview lenticular transparencies which, lighted from behind, have less distortion apparent. The prints have but a vestige of depth, quickly dispelled into chaotic confusion when the spectator moves his head. When only two views of the subject are available for making a print, little in the way of quality can be expected.