A High Speed Color Film For Underwater Photography

Ira B. Current

doi:10.1117/12.953482

1 June 1971 A High Speed Color Film For Underwater Photography

Ira B. Current

Proceedings Volume 0024, Underwater Photo-Optical Instrumentation Applications III; (1971) https://doi.org/10.1117/12.953482
Event: Underwater Photo-Optical Instrumentation Applications, 1971, Honolulu, United States

Abstract

For some time, GAF Corporation has produced a D1000 Blue Insensitive Color Film Type 2575 for use in aerial photography over water, where the recording of blue light is undesirable and unnecessary. In fact, it has been the practice in aerial color photography to filter out the blue light reaching the film, even when recording with ordinary tri-pack color films, by means of a yellow filter over the camera lens. In this case, the resulting pictures have a yellow appear-ance due to the formation of the yellow dye in the unexposed blue-sensi-tive layer of the reversal processed film; and the filter factor required in making the exposures seriously reduces the effective speed of the film in a situation where maximum speed may be needed for penetration of water depths. With the blue-insensitive film, no filter is required, and in addition to this, due to the fact that no blue-sensitive layer is present to absorb part of the light reaching the green and red sensitive layers, the effective speed of the film is in-creased by about one stop over that of' the conventional GAF 500 Color Film. (Ref. 1 and 2)

Citation Download Citation

Ira B. Current "A High Speed Color Film For Underwater Photography", Proc. SPIE 0024, Underwater Photo-Optical Instrumentation Applications III, (1 June 1971); https://doi.org/10.1117/12.953482

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