1. Abstract 
The subject matter deals with a method, for calibrating close-up cameras 
intended for photogrammetric measurements, based on photography of three- 
dimensional test objects. The geometric requirements on them is discussed. The 
test objects have well surveyed targets. Their image co-ordinates are measured 
in a comparator. The observations are adjusted by the method of least squares 
in order to give information about the elements of interior orientation, their 
accuracy and the accuracy of the image co-ordinates. Distribution of and cor 
relation between the residuals is determined and discussed. Some of the data 
programs used are described.