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Eidophor was a projection system developed by a group of Swiss scientists. It was adapted by CBS for use with its field sequential color system. Peter Yanczer's excellent article describes the technology.
Dichroic Wheel. Note the differences in the colors when light is transmitted through (left) and reflected off (right side of right picture) Color wheels from a Swiss GRETAG Eidophor projector. Note Here is a story about operating an Eidophor from Mark Sutton from Portland:
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