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Fig. 9. The vertical parallaxes, indicated in 44 caused by the lens distortion of the 
unit Aviogon camera - infra filter at forward overlap of 60 %. The streaked 
surfaces represent the residual vertical parallaxes. 
3.7 Special conditions 
In [14] some reflections have been made as to the shape of the lens 
distortion curve. Thus, the special conditions are studied that will give 
no residual vertical parallaxes in the points of the relative orientation. 
Such a zero-point of the “six-point scheme” requires that the two 
points of the lens distortion curve shall lie along a straight line through 
20