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Telecine s that use a monochrome CRT as the light source can be referred to as flying spot scanners. Historically, flying spot scanners were also used as primitive live action studio cameras at the dawn of electronic television, in the 1920s. {Link without Title} A projector equipped with a spinning perforated disc created the spot that scanned the stage. This required a completely dark stage, and was impractical for production use, but gave early researchers a way to generate live images before practical imaging pickup tubes were perfected.