Navitar 681MCL012 Installation Instructions

Navitar/NuView Series 681 lens on Eiki model LC- 80 Projectors.

TOOLS REQUIRED: PHILLIPS HEAD SCREWDRIVER 

Disassembly: 

1.  Disconnect unit from power source and place projector with lens facing you. Remove two 

(2) screws from top cover of lens. Remove cover and set aside for reinstallation.  

2.  Remove prime lens by lifting the lever on the left side of the prime lens and sliding the 

lens away from the projector. 

Assembly: 

1.  Ensure that your Navitar lens and its adapter are separate. Position the adapter with the 

‘up’ label in the correct position and slide the adapter into the projector ensuring proper 

engagement. Rotate the lever counterclockwise until the adapter is securely in place.  

2.  Replace the front cover of the projector removed in step 2, above. 

3.  Install the lens by gently rotating clockwise as it is inserted into the adapter. 

4.

  To focus, gently twist the front of lens.  To zoom, loosen thumbscrew and twist knurled 

ring (zoom lenses only, of course).  Re-tighten thumbscrew.  CAUTION: Do not twist 

entire lens out of adapter!