sa 
  
Fig. 5 Planimat with EZ—2 tracing table and printing counter 
Of these figures, the continuously covered focal-length range is particularly noteworthy. Thus the 
instrument is designed so that 9" x 9" ultra wide-angle photography can be plotted just like ordinary 
wide-angle photography taken with a 6" lens or intermediate-angle photography taken with an 814^ 
camera. However, normal-angle photographs obtained with a 12" camera can be inserted just as 
easily. The maximum plottable angle — as measured across the diagonal — is 125°. 
4. Accuracy 
Detailed testing of the instrument in the different working ranges and for the various applications 
will have to be the subject of future studies. The following values*) may serve for orientation, which 
were determined — as the mean of several grid measurements — in the photogrammetric laboratory 
of the Zeiss Works, using measurements of 45 points within the main model area: 
Focal length 
  
Horizontal | Vertical accuracy 
accuracy 
in photograph 
  
88 mm + 5.1 um | + 0.056%/ 00 Z 
153 mm + 3.5 um + 0.037%, 
210 mm + 4.0 um + 0.045°/00 
305 mm + 45 um + 0.049°/00 
  
Fig. 6 Roller-nut system on x-spindle of Planimat 
*) mean square coordinate error of individual measurement 
197