REIN SE phy esent yen t 2 
  
  
= 
  
  
ESSEN NN AS 
The large decentered lens distortion of the Pleogon lens is also 
reflected in a distance between the principal point of autocollimation 
and the point of best symmetry of approximately 50 jum, while this 
distance is approximately 7 um for the Super-Aviogon lens. 
  
  
pm 
15 
9 3 
jo qe 
y WY YY 
O g oO 
5 © o o o e 
o o 
Oo o ° 
o 
Gi gum Ere 0 16 9 15cm 
o 
-3 
e o 
-10 o 
o 48 49 31 18 7 
o 40 40 33 2 10 
  
  
«9 
Fig.5 Average radial lens distortion (calibration 
no. 4b, [11]) 
- circles: Super-Aviogon no. 15 UAg R-10 
— dots: Pleogon no. 98222 
- numbers at bottom: number of averaged 
data points 
-l0-