Abstract
HIGH-SPEED cinematography, that is, a camera operating at speeds up to 3,000 pictures per second, presents special lighting problems as compared with the more conventional speed of 24 frames per second normally used for ciné-film photography. The light intensity for a satisfactory exposure to be made at these high speeds is approximately proportional to the ratio of frames per second, and with an average object having a reflectivity of 10 per cent, the illumination required is about 10,000 foot-candles for a lens aperture of f 2·7. However, at higher speeds the total exposure-time seldom exceeds 3 seconds, and it is therefore possible to consider other means of obtaining these very high intensities than by ordinary methods.
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BEESON, E. A High-Intensity Light Source for High-Speed Cinematography. Nature 164, 453–454 (1949). https://doi.org/10.1038/164453b0
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DOI: https://doi.org/10.1038/164453b0
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