Leica DUOVID 8+12 x 42 Notice D'utilisation page 24

Attention:
Do not adjust the magnification with the diopter
ring released. The left ring for adjusting the
magnification is locked when the diopter ring is
released.
For viewing on just the left or the right side, the
other eye should be kept closed or the appro-
priate half of the binoculars simply covered at
the front on the lens.
The set value can be conveniently read from the
accurate scale on the diopter ring.
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