565 



TABLE 606.— RESOLVING POWER AND EDGE GRADIENT VALUES 



(concluded) 



Part 2. — Values 



Edge 



Resolving gradient 



Material power (X 10-*) 



Motion-picture films : 



Fast panchromatic 95 8 



Medium-speed panchromatic 100 9 



Fine-grain panchromatic 100 10 



Positive (regular) 105 18 



Positive (fine-grain) 130 22 



Professional sheet films : 



Fast panchromatic 85 11 



Fast orthochromatic 100 10 



Medium-speed panchromatic 75 10 



Medium-speed orthochromatic 75 11 



Blue-sensitive 90 10 



Amateur roll films : 



Fast panchromatic 95 10 



Fast orthochromatic 100 11 



Fine-grain panchromatic 105 12 



Process films and plates : 



Panchromatic film 125 22 



Orthochromate film 130 23 



Blue-sensitive plates 110 18 



High resolution plates : approx. 2,500 * 



* This value was obtained by direct exposure to a line interference pattern. With conventional meth- 

 ods of measurement, the value is limited by the optical system rather than by the characteristics of the 

 emulsion. 



TABLE 607.— RELATIVE PHOTOGRAPHIC EFFICIENCY OF ILLUMINANTS 



Photographic efficiency, Er* 



Color , A 



temperature Blue Ortho- 

 Source rating sensitive chromatic Panchromatic 



Sun 100 100 100 



Zenith blue sky 700 285 300 



Carbon arc, white flame 440 220 230 



Mercury arc, H-l 135 120 90 



Mercury arc, H-4 225 175 130 



Mercury arc, H-6 340 245 160 



Fluorescent, standard warm white 70 70 75 



Fluorescent, daylight 125 150 120 



Incandescent tungsten 2848° 40 50 70 



Argon glow lamp 21,000 60 35 



* Er = relative photographic efficiency of source evaluated on basis of equal visual intensities. 



SMITHSONIAN PHYSICAL TABLES 



