Nikon EDG Instruction Manual page 29

Diopter adjustment adjusts the balance of right
and left eyesight. If more than one viewer uses the
same binoculars, adjustment is necessary when a
different person uses it.
If binoculars are used by one person only,
readjustment of the diopter is unnecessary after it
has been initially adjusted.
1 Push the focusing ring ① in and look into the
left eyecup with the left eye.
Then focus on a distant object by rotating the
focusing ring ① .
2 Pull out the focusing ring ① so that the diopter
adjustment ring ② becomes operable.
3 Look into the right eyecup with the right eye,
then focus with the right eye on the same
target while rotating the diopter adjustment
ring ② .
4 Check focusing on both eyes <Confirmation of
diopter adjustment>.
5 When in focus, push the focusing ring ①
in to prevent the operation of the diopter
adjustment ring ② .
6 When the subject changes, refocus the new
subject by rotating the focusing ring ① .
・ Rotate clockwise to focus on a more distant
subject.
・ Rotate counterclockwise to focus on a closer
subject.
7 When focusing is not necessary, set the focusing
ring ① in the diopter adjustment position, so
that it doesn't change the focusing position
even if you accidentally touch it. (Be aware that
diopter adjustment becomes operable.)
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