Recording Tests on some Recent High-Resolution Experimental Emulsions

In another paper¹ it is shown that present commercial sound-recording emulsions have least distortion at very low density, accompanied by an undesirable amount of ground-noise if used as a positive. — A new experimental emulsion, E.K. 0-7461-1, differs from present emulsions in having extremely high resolution and minimum distortion at a density of approximately 1.5. Its speed is less than that of regular recording stocks, but since it is used with white light and no filter is required, sufficient densities are readily attained with present optical systems. These characteristics offer possibilities heretofore not attainable. — The high resolution, low image spread, and low film-hiss of this emulsion make possible recording a positive sound-track that can be played directly, eliminating the distortion usually introduced in printing and the ground-noise contributed by the negative. — The advantage of direct playback will be realized whether the recording is standard, Class A push-pull or Class B push-pull. The perfection of image definition in the new emulsion means increased processing tolerances in adjusting the Class B system for perfect cross-over between the negative and positive half-waves. — It is not at present feasible to use this emulsion as a negative for making prints on positive stock. For special sound-films without pictures, it may be used for a printed positive, using a negative made on the same stock, provided printer losses are not excessive.

Print ISSN

0097-5834

Published

1938-01

Content type

Original Research

DOI

10.5594/J14712