Newcon Optik NSN: 5855-20-000-8284 NVS 7 - Manual (Page 16)

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1. Make sure the unit is off.
2. Remove the lens cap (6, Fig.1).
3. Detach the current lens: hold the lens by its base (1,
Fig.1) and rotate it counter-clockwise. Once the lens has
been removed, store it in a safe, clean space.
4. Screw in (clockwise) new lens.
The threads are very fine (to prevent humidity penetration) and
can be damaged easily. Do not apply force to the lens rotation. If
lens does not screw in smoothly make sure that the threads
match.
Unit is ready for operation immediately after the lens change.
Warning: Forcing installation of the lens may damage
the thread and cause costly repairs to both the goggles
and the lens that are not covered by warranty.
Figure 5
NVS 7 with 4x lens
Figure 6
NVS 7 with 8x lens