The RBT Company in Germany has been joining 2d cameras to create 3d stereo cameras for quite a few years now. They probably started inspired by the work of Fritz Ochotta, linking Yashica cameras. Their web site is: http://www.rbt-3d.de/. The importer of RBT products in the USA is 3D Concepts: www.stereoscopy.com/3d-concepts/. Here is a list of the RBT cameras I am aware of:
A. RBT SLR cameras – Usually prefixed by “X”
RBT 108: Yashica 108 bodies, Yashica/Contax (Y/C) mount
RBT 109: Yashica 109 bodies, Y/C mount
RBT X2 – Ricoh KR 10M bodies, Pentax K mount
RBT X2II: Ricoh XR-X3000 bodies, Pentax K mount
RBT X3 – Ricoh XR-X3PF bodies, Pentax K mount
RBT X4 – Cosina Cs1 bodies, Pentax K mount
RBT X5 – Cosina FM10 bodies, Nikon F mount
B. RBT Rangefinder cameras – Prefixed by “S”
RBT S1 – Konica Hexar bodies, fixed 35mm f2.0 lenses, 59mm lens spacing
RBT S1b – Like above with only 45m spacing of lenses
RBT S2 - Voigtlander Bessa R2 bodies, Leica M mount
RBT S2a - Voigtlander Bessa R2a bodies, Leica M mount
RBT S2b - Voigtlander Bessa R2b bodies, Leica M mount
RBT S3a – Voigtlander Bessa R3a bodies, Leica M mount
RBT S3 – Zeiss Icon bodies, Leica M mount
From what I gather from the RBT web site, only the 109, X2II, X4, X5 and S2, S2b, S3, are currently produced. The 3d-Concepts web site lists as S3 a Voigtlander camera with Bessa R3 bodies. I am calling S3 the Zeiss Icon camera, following the RBT web site.
Most RBT cameras come in one of three configurations: A, B, C. More about these configurations in the following blog.
I have personally owned the following cameras: 108, X2II, X3, X4, S1, and now S3. The RBT S1 remains my favorite stereo camera.