Colour stereociné photography with twin cameras through the operation microscope.
C I Phillips, A J McDonald · PubMed · 1975
Two Beaulieu R16 cinecameras attached toa Zeiss operation microscope, OP Mi2, one for each side, produced colour cine films. When these were projected through polarizing filters on to a silver screen, the audience (wearing appropriately oriented polarizing spectacles) achieved a stereoscopic view.