Newcon Optik NVS 6 - Manual (Page 35)

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Figure 2-10 eye-spam knobs
Now, turn the fore-and –aft adjustment knob to move the
monocular closer to the eyes as desired for individual preference
without your eyelashes touching the eyepiece lenses. A 25mm
eye relief distance provides the optimal field of view for the
larger 25mm eyepieces.