The camera also automatically controls the aperture in the 8 x 
zoom objective. Each variable magnification is controlled via a 
precise stepping motor. By means of a Pechan prism you can 
steplessly turn the image by 2 x 360° which can be essential for 
certain detail interpretations. 
For Kern, the manufacturer of this system, it is a matter of course 
that apart from the image rotation you can switch from negative 
to posi ti ve - the importance of which has been described in detail 
with the RK 820. An additional characteristic of the Zoom Sight 
20 X is the possibility to represent details more clearly by either 
amplifying or weakening the image contrast. 
With this system - the Zoom Sight 20 X - Kern & Co. AG has 
developed an interpretation aid that cannot only be used for the 
interpretation of aerial photos and satellite images but also for 
the interpretation of applied photography. 
Image rotation of the Zoom 20x - 
original image size of a tank 1.2 mm; 
magnification approx. 50 mm; better 
evaluation possibilities by image 
rotation and by use of the shadow 
incidence.