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Zoom Sight 20 X 
The Zoom Sight 20 X by Kern & Co. AG is the second new 
product in the sector of optical interpretation aids to be discus 
sed. 
The Zoom Sight 20 X is a mechanical-optical electronic system 
with which you can interpret a mono image only via a screen. 
With the optical system of the Zoom Sight 20 X two zoom lenses, 
which are staggered by 90°, are interconnected in series. 
Here are the most important optical data: 
■ Overall zoom range 
■ Lens diameter 
maximum 
minimum 
■ Display field diameter 
■ Colour correction 
■ Focusing range min. 
■ Resolution with largest 
magnification in middle of image 
■ Contrast, measured at aperture 
F= 11 
■ Working distance 
As shown in the figure, the lens captivates with its compact con 
struction - just like the entire system in its compactness shows 
space-saving and mobile features. 
The image is transmitted to the high-resolution television came 
ra- especially designed for this device - via three 90° deviating 
prisms thus referring to the electronic part. 
20:1 
176 mm 
8.8 mm 
16 mm 
545 - 608 nm 
6 mm (+/- 3 mm) 
> = 60 Lp/mm 
> = 50% 
167.44 mm 
Zoom 20x, complete lens arrangement