Nikon NP4100 - Manual (Page 35)

2. Installation and Connections
20
2.
Push the LENS
RELEASE button all the
way in and rotate the lens
counterclockwise.
The existing lens will be
disengaged.
Note:
If the lens cannot be
removed even by using
the LENS RELEASE
button, the anti-theft
screw for lens may be
in use to secure the
lens. If that is the case,
remove the anti-theft
screw first.
3.
Pull out the existing lens
slowly.
CAUTION:
When Installing the lens into the projector, be sure to remove the lens cap
from the back of the optional lens before installing the optional lens into the
projector. Failure to do so will cause damage to the projector.