T.O. 33B-1-16-23d. Class4: These high-speed films, by comparison, are considered to have a low signal-to-noise ratio andinclude Agfa D7, Kodak Type AA, and Fuji IX 100.6.4.1.3.1.1This classification differs from others because it is based upon the signal-to-noise ratio rather than speed. Figure 6-12is a bar chart showing the relationships of signal-to-noise ratios, film speed, and detail resolution capabilities of thedifferent film classes. Table 6-3 and Table 6-4 are a more detailed guide to film classification. It is not inclusive of allthe film types or manufactures that may be authorized for use since manufacturers may introduce new films from timeto time. Specific inspection instructions may specify film other than what is listed. Each manufacturer has a particulardesignation for films. Small variations may be noted in film speed and contrast of the films made by the differentmanufacturers within a particular class.Figure 6-12. Relationship between Signal-to-Noise Ratios and Speeds of Film.
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