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5.6 Focusing
To obtain sharp image at other distance adjust the lens
focus (7, Fig.1) leaving eyepiece setting intact. You
should be able to obtain a sharp image for distances from
0.2-10 m to infinity depending on lens magnification.
5.7 Using Unit with headgear
Prior to using the unit with the headgear adjust all the
straps to the head size.
When wearing the unit the eye-relief (the distance
between your eyes and the eyepieces) should be 15-22
mm. In order to achieve this, loosen the locking screw
(8, Fig.1) and set a comfortable distance between the eyes
and the eyepieces; then tighten the locking screw
(8, Fig.1).
5.8 Interpupillary distance
The unit is designed to accommodate interpupillary
distance of 58-72 mm without any additional adjustment
and should be comfortable for 99% of adults.