Nikon EDG 7x42DCF User Manual - Page 12

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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 centers of right

and left tubes need to align.