By coincidence someone over on the LF Forum has recently been looking for infrmation but his Tri-colour camera. A big old beast which uses beam splitters to direct light through filters to 3 separate sheets of film to give simultaneous colour separation negatives.
The original Technicolour process for cinematography used a truly monstrous camera which did a similar trick to shoot 3 strips of film simultaneously, again one for each primary colour.
A few years ago I as lucky enough to see a newly struck print of Gentlemen Prefer Blondes, and the colour was utterly stunning.
ps- This has wandered some way from the original post. Sorry
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