Using Nikon Binoculars

Foldable eyecup for eyeglass wearers
Nikon binoculars are designed to provide a sufficient field of view even for eyeglass wearers by simply folding back the eyecup so as to place the eye at the correct eyepoint.
Otherwise the field of view might be partially shaded.

adjust pupil distance Adjustment of pupil distance
The purpose of this adjustment is to align the exit pupils of the binoculars with the pupils of your eyes. If they are not correctly aligned, you will experience discomfort from having to use only one eye.

Nikon binoculars offer a wide range of pupil distances so anyone can use Nikon binoculars in comfort. While you look at a distant object, carefully move the binocular tubes downward or upward so that both fields are correctly aligned, forming a perfect circle.

Pupil distance is not adjusted. (The central part might be invisible or an eclipse might appear at the corners. )

Pupil distance is properly adjusted.

Focusing

dioptre adjustment
If there is a difference in visual acuity between your left eye and your right eye, you need to make a dioptre adjustment.
Looking through binoculars without dioptre adjustment will not yield a sharp, crisp image because one eye sees things in focus while the other doesn' t. Worse still, you will suffer eye strain. Most binoculars have a mechanism that compensates for different dioptres. All Nikon prism binoculars have this mechanism. There are two (2) adjustment methods depending on the type of binoculars.

[ 1 ] For CF (Central Focusing) binoculars
First look through the left eyepiece with your left eye while closing your right eye and turn the central focusing ring to focus on a distant object. Then look through the right eyepiece with your right eye while closing the left eye, rotating the dioptre adjustment ring to focus on the same object.


1) Focus with your left eye.	2) Adjust dioptre with right eye.	When the dioptre is adjusted, turn the central focusing ring to focus on the object.

[ 2 ] For IF (Individual Focusing) binoculars
You can adjust the dioptres of both eyepieces independently.
Focusing and dioptre adjustments are performed simultaneously, but a change of object requires both ring.


Focus with your left eye.	Focus with your right eye.

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