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A ThreeDimensional ExposureMeter For Professional Use
By WILSON LEAHY
TWO of Hollywood's leading experts in photoelectric light-measuring* technique have joined forces to perfect the first light-meter designed solely to meet the specialized requirements of the professional cinematographer. Becoming acquainted through articles on exposure-metering which each had written for The American Cinematographkr, Karl Freund, A.S.C., ace director of photography, and Capt. Donald W. Norwood, until his retirement an ace photographic expert of the U. S. Army Air Corps, found that Freund's experiences as a practical cinematogra
pher supplied the missing links Norwood needed to perfect his "prevailing illumination" type of exposure-meter for studio use. With the benefit of the intimate data concerning studio conditions which Freund was able to supply, Norwood has developed a radically different type of meter which has already proven itself on actual production.
Both of them recognized that the professional cinematographer's exposuremeter requirements are unique, and not met by any commercially-available instruments thus far. The conventional reflected-light meter made for
amateur use is useless to the professional, since with every factor under close control, the professional is not interested in either overall illumination per se, or in the reflective values o: scene or set.
In the same way, the general practici of using" a conventional meter for arbitrary incident-light readings on the key light is admittedly a makeshift. It gives a reading on a single light-source, but does not take into consideration the effects of such other inevitable angles of lighting as filler-light, cross-light, etc.
What the professional needs is an in
416 September, 1941
American Cinematographer