Panasonic ak-hc931 Benutzerhandbuch

12

Adjust the flange back (distance from the surface where 
the lens is mounted to the surface where the images 
are formed) if the subject fails to be precisely focused at 
both the telephoto and wide-angle settings when zoom 
operations are to be performed.
Once adjusted, the flange back does not need to be 
adjusted again unless the lens is replaced.

   Mount the lens on the camera. Do not forget to connect 

the lens cable at this time.

  Set the lens iris to manual, and open the iris.

  Set the lighting in such a way that the appropriate video 

 

 output level is obtained at a distance of about 10 ft  
(3 meters) from the flange back adjustment chart.

 

If the video level is too high, use a filter or shutter.

  Loosen the screw that secures the F.f (flange focus) ring.

 

 Depending on the lens concerned, this ring may be 
marked as the F.b (flange back) ring.

   Set the zoom ring to the telephoto position either by 

manual or electrical means.

   Shoot the flange back adjustment chart, and turn the 

distance ring to adjust the focus.

  Set the zoom ring to the wide-angle position, and turn 

 

 the F.f ring to adjust the focus. Take care not to move 
the distance ring.

   Repeat steps 5 to 7 until the chart is focused properly at 

both the telephoto and wide-angle positions.

  Tighten up the screw that secures the F.f ring.

<Note> 
For details on the adjustment method and positions of the 
lens parts, refer also to the instructions that accompany the 
lens.