Navitar 646MCL1028 Installation Instructions

Installation of Navitar/NuView Series 646 lens on Hitachi CP-X1200, 

X1250 & SX1350 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.  Separate your Navitar lens and adapter (except on MCZ275) by gently rotating the lens 

counterclockwise while holding the adapter. DO NOT place undo pressure on the lens to 

separate as this may result in damage to the nylon drive pin. 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.  Reinstall 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.