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THE FILM 83
be identified by a can number; it is desirable to serially number the cans for each particular manufacturer's laboratory.
Because of the high order of accuracy in developing control exercised, it is recommended that the initial exposure tests be made with Kodachrome that is shipped to Eastman Kodak for processing. It is suggested also that about 5 feet of unexposed film be Left on the outside of the test roll; in the developing instructions accompanying the log sheet it is desirable to request that the unexposed film be exposed with a IIB sensitometer strip and other suitable standardized exposures.
When the test is returned from Kodak, the projection of the test will indicate whether the lens //stop markings are seriously in error and what setting corrections should be made. This exposure test supplements the lens transmission test previously described and should confirm the findings of the transmission test. In general, the production exposure chosen should be J light stop underexposed as determined by these tests. (It is better to underexpose than to overexpose; if in doubt — underexpose.)
If the laboratory is located sonic distance from location, it is usually good practice to ship exposure tests to the laboratory some two weeks before production shooting is scheduled to begin. A time interval is usually necessary to check and correct minor difficulties that might otherwise arise unnoticed. Should doubt ever arise concerning the control of exposure, it is usually best to make a complete new series of tests.
Since the shooting of the picture may extend over a month or more, a schedule for developing the exposed film should be arranged with the film manufacturer's laboratory. Although it is customarily good practice to develop film within 24 hours of exposure, in the case of color film it is actually preferable to accumulate all the film exposed during a week, for example, or for the duration of all shooting, and to ship it to the laboratory for developing in a single lot. This procedure is especially advantageous for developing Kodachrome or AnscoColor because a shift in color balance from one day to another does occur in developing. while the drift in color balance that occurs during a single day is much smaller. To make such a scheduling procedure workable requires suitable cooled storage for the accumulated film and identification of the cans for the date of exposure. To get the most from the arrangement, the developing instructions accompanying the film should refer to the laboratory identification number and the date that the reference test was developed.