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They produce a Three D or (stereo) Illusion with converging visual images and usually employ two cameras (and in the case of films Projector ) often special glasses are needed for spectators, if you wear regular specs, this can be a problem. The Eyeglass angle naturally led to the idea that such things-Three-Dimension films, etf posed visual hazards and this was a potent argument against them, nobody wants to Go Blind from watching movies! There were a number of inventors, the British had one in the nineteenth century, Justice Oliver Wendell Holmes was involved with the Stereoptikon, which he refused to commercialize, the modern View-Master came out in the fifties, and used three reels ina basic set in part suggesting the name-like Ring- Master but with three reels rather than rings- Circus acts were figured as were amusment parks. Zeiss made a stereo camera- stereo Palmos with automatic geared parallax correction, it was two bellows cameras in paralell, way back in l902-06 and it was phased out around l9l2/ Does that answer your question?

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