666 



HANDBOOK OF PHOTOGRAPHY 



men have been enabled to reduce lighting or to stop down lenses and improve depth of 

 focus — an opportunity of which not all have taken advantage. 



Reduction in grain size has entailed the use of appropriate developers, especially 

 those of the borax type. As will appear in later sections of this chapter, improvements 

 in lighting and chemical treatment have accompanied improvements in sensitive mate- 



Eastman Motion Pict\ire 

 Negative No. 1201 



Daylight 



Tungsten 





Eastman Background X 

 Negative No. 1230 



Eastman Super XX Pan- 

 chromatic Negative No. 

 1232 



Eastman Motion Picture 

 Positive Nos. 1301, 13.59, 

 1355 and type B, 1362 



Eastman Duplicating 

 Negative. Regular No. 

 1503 and Fast No. 1.505 



Daylight 



Tungsten 



Daylight 



Tungsten 



Tungsten 



Tungsten 



Fig. 5. — Wedge spectrograms for Eastman motion-picture films. 



rials throughout motion-picture history, and if further progress is brought about in 

 materials, it will no doubt be reflected in the associated fields of exposure and 

 processing. 



A discussion of motion-picture-film characteristics will have only academic interest 

 unless it deals with actual materials available in the market. For this reason raw 



