Adjusting the Lens Flange Back

 

7

If images are not clearly focused at both telephoto and

 

 

wide-angle positions during zoom operations, adjust the

 

 

flange back (distance from the lens mounting surface to the

 

 

image formation surface).

 

 

Once adjusted, the flange back does not need to be

8

re-adjusted as long as the same lens is mounted on the

camera.

 

 

 

 

 

 

NOTE

 

 

9

Please also refer to the lens instruction manual for directions

on adjustment and locations of individual lens parts.

 

 

 

 

 

 

 

1

 

Mount the lens on the camera.

 

 

 

 

 

• Make sure you connect the lens cable.

 

 

 

 

 

 

 

 

2

 

Set the lens iris to manual, and fully open the

 

 

 

 

 

iris.

 

 

Approximately 3 m

Set the zoom ring to the wide-angle position and turn the F.f (flange focus) ring to adjust focus.

• Do not move the distance ring during focusing.

Repeat Steps 5 to 7 until the lens is in focus at both the telephoto and wide-angle positions.

Firmly tighten the F.f ring clamping screw.

Preparation Chapter 5  

3

 

Place the flange back adjustment chart about

 

 

 

3 m from the lens and adjust the lighting on

 

 

 

the chart to obtain an appropriate video output

 

 

 

level.

 

 

 

• If the video level is too high, use the filters or the

 

 

 

shutter.

 

 

 

 

4

 

Loosen the F.f (Flange focus) ring clamping

 

 

 

screw.

 

 

 

 

 

 

 

NOTE

 

 

 

F.b (Flange back) may be indicated on some lenses.

 

 

 

 

5

 

Set the zoom ring to the telephoto position,

 

 

 

either manually or by electric drive.

 

 

 

 

6

 

Shoot the flange back adjustment chart and

 

 

 

turn the distance ring to adjust focus.

99