Proposed American Standard PH22.90 Aperture Calibration of Motion Picture Lenses

STARTING ABOUT 1940, there has been a rapidly growing need in the motion picture industry for a more accurate expression of the photographic speed of a lens than is afforded by the simple f-number ratio. The Proposed American Standard appearing on the following pages is the product of many years' industrious and patient effort to achieve agreement on a standard photometric method of aperture calibration. It is published here for 6-month trial and criticism. All comments should be sent to Henry Kogel, SMPTE Staff Engineer, prior to April 15, 1953, along with a carbon for R. Kingslake, Chairman of the Optics Committee.

Print ISSN
Published
1952-10
Content type
Original Research
DOI
10.5594/J01786