Newcon Optik NVS 6 - Manual (Page 34)

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CAUTION
Do not attempt to adjust the eye-span distance by pulling the
monocular away from each other or pushing them together.
Using force on the monocular to make this adjustment will
damage the adjusting mechanism inside the adjustment shelf.
Use only the eye-span knob(s) to adjust the eye-span distance.
If your eye-span distance has measured prior to mounting the
goggles, turn the eye-span knobs(s) (See Figure 2-10) to set this
value on the scale.
If not move the goggles closer together or further apart to adjust
the eye-span distance for the proper spacing between your eyes.
When properly adjusted, the edges of the images in both
monocular will be clear and the resultant goggles view will
appear as a single circle or as two circles, overlapped and slightly
displaced laterally.