A Light Intensity Meter

Ever since the beginning of photography, the judging of light value has been one of the great problems, to the photographer or camera man. In many cases in the past as now, the person responsible for taking of pictures is required to judge light values using his naked eye as an indicating means. His accuracy or ability to do this is the product of his appreciation and his experience as received through this natural indicator. The unassisted eye at its best is considered unstable with a possible error of 100 percent or more from day to day when used as a light intensity measuring instrument. It is unreasonable to expect that two or more men would come very close in a simultaneous check. In order to assist the eye in measuring light and to obtain consistent results, several types of photometers have been developed. In most cases, these instruments are rather awkward to use because they require a comparatively slow process of matching of light intensities, to obtain a reading. Therefore, they might be classed as laboratory equipment, from a studio standpoint, rather than practical and portable direct reading indicators.

Print ISSN

0097-5834

Published

1930-03

Content type

Original Research

DOI

10.5594/J13086