Newcon Optik NVS 6 - Manual (Page 33)

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CAUTION
Do not attempt to adjust the tilt angle of the goggles by pushing
or pulling the monocular up and down as this will damage the
adjustment mechanism. Use only the tilt lever to make tilt angle
adjustments.
Move the tilt lever (see Figure 2-8) up or down to obtain the
optimum line-of-sight view. If the upper or lower edges of the
image areas are blurred, adjust both the vertical adjustment knob
and the tilt lever until the blurred edge is removed and an optimal
line of sight is achieved.
Turn the fore-and-aft adjustment knob (see Figure 2-9) to move
the monocular away from the eyes as far as possible without
losing the field of view. This makes edge clarity easier to judge.
You may use the fore-and-aft scale to preset this adjustment.