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350 L. THOMPSON
Kodachrome film is suitably color-balanced to match it. The Type A or artificial-light Kodachrome film is suitably color-balanced to match the photoflood type of illumination which has a color temperature of approximately 3450° Kelvin when used on a 120-volt line.
Filters were made available for these two films principally to permit the use of short unexposed pieces of film, remaining in the camera, in different types of illumination than originally specified. Rather than discard the film when the illumination is changed, it may be exposed by using the proper filter. For this purpose the No. 80 filter, which is light blue in color, was made available for use on the camera lens when daylight-type Kodachrome film is to be used indoors with photoflood illumination. The No. 85 or orange-colored filter was made available for use with the Type A film in using the short lengths of film out-ofdoors. It is not the intention of the manufacturers of Kodachrome film that either film should be used as an all-purpose film with filters hi opposite types of lighting for which the film was manufactured.
For the most satisfactory results on Kodachrome film the daylight type of film should be used when pictures are made in the normal mixture of sunlight and blue sky; Type A Kodachrome film should be used with the photoflood type of lamp on a line of proper voltage.
There are many factors relating to the use of filters with various light-sources which enter into such a discussion, and the technical reasons for not using filters, unless necessary, are many and require a much lengthier technical discussion than is permissible here. However, it is sufficient to say that if daylight type of Kodachrome film is used in sunlight and the Type A Kodachrome film is used with either the No. 1 or No. 2 photoflood lamps; and if a color-temperature meter is used to check the color quality of the light-source to make certain that it is approximately 3450 ° Kelvin, the best possible color rendition will be obtained on each type of film.