Eschenbach Prisma Manuel D'utilisation page 12

Operation
Switching on / off
Press the button to switch on the Prisma. The illumination immediately switches
on automatically. Press the button again if you want to switch the Prisma off.
Illumination
Press the button to switch on the illumination. Press the button again if you
want to switch it off.
Display mode
For the negative mode, turn the button in a clockwise direction (white
lettering on a black background).
For the positive mode, turn the button in an anti-clockwise direction
(black lettering on a white background).
The middle position displays the magnification in the photo mode.
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