Glen Elie


A new procedure for measuring the MTF of non-developed emulsions is discussed, which uses a coherent energy source and interference system to produce sinusoidal fringes on a film sample. The transmitted light is projected onto the scanning slit of a photomultiplier, and its variations registered on a chart recorder. Measurements are taken directly from the traces of the irradiance distribution to calculate the optical part of the MTF of the sample. This system does not require development of the film, and is therefore free of the non-linearities inherent in traditional test methods. Results are obtained for Kodak Panatomic-X, Kodak High Contrast Copy, and Kodalith Ortho Type 3 films, and compared where possible to the MTF derived from standard techniques. The MTF found from this study is that of the light distribution in the undeveloped emulsion layer, while the conventional method gives the MTF of the developed film. Adjacency effects in development cause the two methods to produce different results. It is concluded that this system is capable of producing excellent results for some types of films. Recommendations are made for improvement of the apparatus to render the procedure more universally suitable.

Library of Congress Subject Headings

Photographic emulsions; Photographic optics; Transfer functions

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Abouelata, Mohamed


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