Newcon Optik DAY/NIGHT VISION SCOPE NVS 10MG - Manual (Page 17)

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- Turn off the switch (10).
In a daytime, set the DAY/NIGHT handle 9 into the
position DAY, check that the switch (10) is in the OFF
position, and then take the light filter (1) off the objective
(2).
In twilight, put the light filter (1) on the objective (2), turn
on the switch (10), and set the DAY/NIGHT handle 9 into
the position NIGHT.
In the night, take the light filter (1) off the objective (2), turn
on the switch (10), and set the DAY/NIGHT handle 9 into
the position NIGHT.