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62 IV. MAKING 16-MM ORIGINALS
To accomplish consistency in the picture original requires consistency in three important particulars :
(1) Consistency in the film. (£) Consistency in its exposure. (3) Consistency in its processing.
Film and Its Consistency. Film and its consistency has been discussed in some detail in an earlier chapter. The most consistent original materials today for 16-mm are integral tri-pack color films ; this is true of both Eastman and Ansco products. As a practical matter it is difficult for a user to be concerned with film consistency without being concerned with processing consistency ; on this count also the integral tri-pack color films are definitely superior.
In general, manufacturers of films do not release information to users on variations in quality from lot to lot of manufactured raw film ; they do, however, keep accurate and extensive records of such variations together with data on the practical effects of such variations upon the usefulness of of the finished product. As described in the previous chapter on film, normal manufacturing variations do occur; there is no magic in the manufacture of sensitized materials that would exempt film from the laws governing the statistical quality variations of manufactured products. For most purposes, the variation in quality within a roll of film, or the variation in quality from roll to roll of film of a particular lot number is not important, while the difference from one lot to another is quite important. For this reason an accurate picture film test exposure and log book is just as important for maintaining picture quality as a similar log book is for maintaining sound quality. Fortunately, the variation from roll to roll and the variation from lot to lot of Kodachrome, for example, is relatively so small that if picture exposure variations would be of like order, there would be no such thing as a really bad original in conventional films. Unfortunately, most of the inconsistency occurs in the exposure of the original film.
Exposure Consistency. Exposure and its consistency depends upon consistency in the readings of a measuring light meter, consistency in the manner of its use, and consistency of the judgement used in transferring the data so obtained into the aperture setting for the lens used. For most uses, calibration of the light meter once a month is sufficient to detect any loss in sensitivity. When such meters are calibrated, all previous calibration data should be available so that the magnitude of the loss in sensitivity can be judged relative to the previous calibrations.