PHOTOGRAMMETRIC ENGINEERING 
  
100 + 
90H 
80} 
70H 
60} 
soL 
40} 
30k 
RELATIVE SENSITIVITY 
207 
lor 
  
A 605 C 
540 
B 
  
  
J 
  
400 
500 600 700 
WAVE LENGTH mu 
FrG. 1. Spectral response curves for the three receivers involved. 
A—the eye to standard illuminant “C.” 
B—Super XX Aero emulsion with Wratten 13 filter to mean noon sunlight, 
C—Super XX Aero emulsion with minus blue filter to mean noon sunlight, 
B & C are on the same scale. 
40? 
  
  
50 
A^ 
Oo 
T 
30[ 
N 
o 
I 
VARIATION OF IMAGE POSITION IN MICRONS 
o 
I 
  
O 
400 
Fic. 2. Chromatic variation of image position at several field angles. Displacements are po 
tive away from the lens axis and for each field angle are relative to the monochromatic ima 
35° 
\ 
  
  
700 
  
WAVE LENGTH mp 
formed closest to the axis. 
Printed in France. — CHAIX, Paris. — 2176-17-6-56. 
    
    
    
     
   
     
   
   
    
     
   
    
   
DIFFEREN 
ba 
© 
T 
  
DISTORTION _ MICRONS 
1 
o Oo 
1 
  
magnitude of such 
was tested on the 
using two differeı 
with the usual “ 
light sources and 
XX plates.” The fi 
monly used Wild 
the second calibrat 
camera but all the 
were screened witl 
transform the effec 
to about that of the 
these calibrations : 
The two upper cu 
distortion data plo 
calibrated focal ler 
length which makes 
The CFL. for 
calibration exceeds 
visual calibration E 
x 
o 
DIFFERENCES IN IMAGE POSITION -_ MICRONS 
© 
  
ALS 
o 
T