Navitar 645MCL1028 Installation Instructions

Installation of Navitar/NuView Series 645 lens on Liesegang model DV 

540, 560 & 880 Flex projectors.

TOOLS REQUIRED: FLAT HEAD SCREWDRIVER 

Disassembly: 

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

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

2.  Remove prime lens by depressing the lever on the left side of the prime lens and rotating 

the lens counter-clockwise. 

Assembly: 

1.  Ensure that your Navitar lens and its adapter are separate (except on MCZ275). 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! ON MCZ275 models twist the inner knurled ring to zoom and 

twist the outer knurled ring to focus the lens.