NEC XT5000 - Manual (Page 15)

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3) Rotate the lens barrel clockwise to fix the lens unit.
Lens barrel
3. Secure the fixed screws and connect the extension cable attached
to the projector.
1) Secure the three screws on the lens holder.
2) Insert the connector of the lens unit into the socket of the ex-
tension cable attached to the projector.
4. Reattach the lens hood.
1) Insert the lower lens hood into the hook.
2) Insert the upper lens hood while pushing the left and right
bottom. Secure the two screws.
Hook
5. Attach the dust cap.
NOTE: This completes installation for the optional lens TL-08SF
and TL-1Z. For TL-2Z and TL-4Z, attach the supplied dust cap as
shown on the next step.