Irradiation halo. Grimeton test field 
Enlargement in microns of white lines on black surfaces. 
Reductions of black lines on white surfaces 
Fig. 1. 4:4. Irradiation halo effects in a test 
photograph from a high tower. 
Flight and illumination direction. 
; '03., 
3813? 
7llu 
75Í 6?, 
57[66 
»al 101 1 
83 U 
50Í57 5S(M 
101 ! 1 
[109 . 76| 83 , 
551«, 47^50 
50|50 
57[68. 45[53 7o[73. 60(56 
Irradiation halo bland test field. 
The enlargement in microns of circular white signals 
in an aerial photograph Aviogon cr153 mm 
h= 1200 m Signal diameter r 120cm or 0.15 mm in the image 
Fig. 1.4:5. Test from the Öland area.