This would be the same as a conventional camera and is used on twin camera stereo photographs and with certain RBT cameras. The Fed Camera can be modified to full frame . Holmes Format A format for stereo cards which are based on a stereoscope invented by Oliver Wendall Holmes. This is the format for most antique cards and have image centers that are further apart than the human eye. This is significant because any viewing device for such cards needs to have a mechanism for bending light before it reaches the eyes.
Most viewers are prismatic.
Later formats for cards were not as large . AutoCAD drawing courtesy of Ralph Johnston. This is usually achieved with a specialized camera or by using a single camera and a sliding camera bar. A provision in some stereo viewers which allows for adjustment of the distance between the lenses of the viewer to correspond with the image's infinity separation and in some cases the distance between a viewers eyes. Macro Stereo Photography Macro Stereo Photography is stereo photography in which the image on the film is about the same size or larger than the true size of the image.