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Ramsdell rig
Please see beam splitter.

Random dot stereogram
This is a type of stereogram in which a three-dimensional image is created by the fusing of apparently randomly-situated dots in a stereo pair. This effect was first created manually by Herbert Mobbs in the 1920s; however it was scientifically developed with the use of computer-generated images by Bela Julesz in the 1960s. This random dot stereogram is a computer-generated image that can be perceived by binocular depth perception means only. It is a method in which a pattern is repeated at around the distance between the human eyes, which is around 2.5-2.75 inches. Minor differences in the patterns from column to column will merge to give you depth information when your eyes have diverged away from their focus point. Unfortunately this method has limitations because only graphics-type images can be shown, not a true-color image.

Realist Format
The realist format is the 5 perforation 35mm slide format of 23×24 which was first invented by the specification of the Stereo Realist camera. It was quickly adopted by numerous other camera manufacturers. It is a stereo format that will use stereo pairs of 5 perforations per image width. It is the most common stereo format and it is used with the TDC Coloris I and II, TDC Vivid, the Kodak and many other cameras.

Real-time 3D graphics
These are produced by a 3D graphics card. Real-time is essential if the images are needed to be interacted with, like within virtual reality, and opposed to viewing a film sequence.
Rear projection
This is when the images are projected out from behind a screen. One big advantage of rear projection is that the viewer cannot cast any shadows by getting in the way of the projector and screen. It is particularly important when the user is interacting with the images which are on screen. For stereoscopic rear view projection there are only certain types of rigid and flexible screens that can be used.

Retinal disparity
Please see Disparity.

Retinal rivalry
This term refers to the simultaneous transmission of incompatible images from each eye.

A rig is defined as dual camera heads that are situated in a properly engineered mounting which are used to shoot stereo movies.

Rochwite Mount
R-mount, Rochwite

This term is the name which is occasionally used to delineate the 41 x 101mm, 1-5/8″ x 4″ mounts used for nearly all stereo slides. Mounts with these outer dimensions are created for the full frame formats, Realist, European and Nimslo. The term is named after the Realist Stereo Cameras inventor, Seaton Rochwite.

Rotation refers to the tilting of the images through not holding the camera horizontally, thus causing one lens to be situated higher than the other during the picture taking stage. As long as the tilting isn’t too severe it may be possible to straighten both images when mounting; however there will be a height error in part of the image.

Row interleaved
This is a format to create 3D images or videos in which each line or row of video will alternate from top to bottom between the left and right eye.

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