a AT A NA 
  
E eus Fr. T Li 
ra 
* 
ar 
E 
E 
Ed 
= 
E 
wi 
Pd 
«41 
  
-64 
Fig. 1. Standard deviations of the Lamegon 8/100 
: for panchromatic (p) and orthochromatic (o) 
emulsions at the object distance "oo", 
  
  
  
  
  
ifoxo2059 nN 
  
  
  
Fig. 2. Principal distance a'and calibrated focal length -