Nikon EDG - Manual (Page 14)

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Nomenclature
⑤
①
③
⑨
⑥
② ②
⑧
⑦
③
④
① Eyecups (turn/slide)
② Neckstrap eyelets
③ Focusing ring
④ Diopter adjustment ring
⑤ Objective lens ⑥ Eyepieces
⑦ Diopter index
⑧ 0 (zero) diopter position
⑨ Central hinge
Interpupillary adjustment
While looking at a subject through the eyepieces,
gently rotate the binocular body (a shown above)
so that the two circular viewfinders become one
(as shown below).
You can adjust the two circular viewfinders into one
even when the image is out of focus.
If the viewfield images are as shown above,
the optical axis has shifted.
If your eyes become tired or you see two
images for one target, it is recommended
that you get your binoculars inspected.
Optical axis: The direction of the eyepiece
tube (optical center).
With binoculars, the optical axes of right and
left tubes should align.
or