After having dev 
great brightness 
  
  
  
  
  
ol the creation of a 
% Hoo 609 700 my 0 309 600 . E. angle lens. I will 
Fig.4. Green filter. Tartrazine m : by the same prin 
6 zZ ef Fig.6. Yellow filter. Tartrazine 
Filter Blue Green 0,35g/m 10g/m In order not to lc 
fects to remove \ 
  
  
+ start with a lens 
di the common cen 
o0 concentrically m 
r4 quite good but a 
30" tem is positive. / 
first of all provid 
whereby one ha 
there remains or 
20 glass cover (fig. 
40- 
84 
44 i A A A n 
o 450 500 5% 600 69 mp 
Fig.5. Sensivity range for " Aviphot Ortho 30°n 
  
  
  
Gevaert. 
> 
42 
ri 
> 
i 
0 
= 
A Fig. 1 
4 b—— | | | A 
6800 7200 7600 8000 8400 8800 
Red | Infrared 
Fig.7. Spectral sensivity of " Kodak Aerografic Infrared Film " 
OBE-tryck Stockholm 1956