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1949 HIGH-SPEED COLOR MOTION PICTURES 593
in the range of from 1000 to 5000 pictures per second on Kodachrome is I1/ 2 stops, while on Super XX film it is only 1/2 stop. Therefore, instead of having a speed relationship of one to eight, the speed relationship becomes one to sixteen. The Kodachrome requires approximately 16 times the exposure that black and white does for an equal degree of sensitization.
Successful color pictures have been made by the Laboratories out of doors in New Mexico at 1000 pictures per second. In these cases the light values were approximately 10,000 foot-candles as measured on the new 757 Weston exposure meter. These pictures are not quite as brilliant as can be obtained with an intermittent camera at //5.6 and 1/M second but from the engineer's point of view they are entirely satisfactory.
For incandescent lighting, it has been found at the Laboratories that color pictures can be made at 5000 frames per second with 400,000 foot-candles' illumination and a lens aperture of //4 for an average subject.
Color photography tells the engineer far more in his analysis of motion than a corresponding picture in black and white. This is particularly important when some portion of the picture may be selfluminous such as spark and arc phenomena and the burning of fuels. However, color photography aids the analyst to differentiate various portions of his picture and is, therefore, not necessarily confined to pictures which may have a self-luminous point in the picture. The Armed Services are finding great use for color film in their high-speed motion picture photography and other organizations are beginning to experiment with it.