Figure 8. Print of typical exposure of DBA Horizontal Test Range made at f/45 by DBA camera of 480 mm 
focal length and 18x18 cm format; camera axis is inclined 45° to target range and is focussed on central 
target at distance of 12.5 meters. 
TABLE 2. 
Results of Various Calibrations of a DBA 480 mm Plate Camera (18x18 cm Format). 
  
QUANTITY 
CALIBRATION 
FOR INFINITY 
FOCUS (Stellar 
SMAC, 266 Images) 
SELF-CALIBRATION (Camera Focussed at s = 12.5 Meters) 
  
Case 1. 4 Stations, 
Common Kappa's 
Case 2, 4 Stations, 
Differing Kappa's 
Case 3. 8 Stations, 
  
o 
x-0 = 
X--90. : *e-90" 
o 0 
x=0, -90 
^ 
  
p (mm) 
c (mm) 
y 2 
K1 (mm 
RMS Error 
of Residuals 
  
  
-. 128 £.035 
.079 £,040 
484.715 +,031 
‚0300 +, 0075 
2.8 um 
  
=, 192 5,016 
„753 +,407 
504,220 +, 390 
—. 0208 +, 0025 
2.8 um 
  
-. 172 +.026 
117 +.020 
504,841 +.021 
-,0141 +.025 
2.9 um 
-.171 3,012 
. 124 +,014 
504.837 +.014 
-.0182 £,0016 
2.9 um 
  
  
  
Cases 2 and 3 Combined 
2790, -90*