Adjusting the lens flange

If the subject is not focused properly in the telephoto and wide-angle modes during zoom operations, adjust the flange back (distance from the lens mounting surface to the image-forming surface).

Once this adjustment is done, it need not be redone unless the lens is replaced.

Adjustment method

<Note>

For details on the adjustment method and lens positions, refer also to the operating instructions that accompany the lens.

Approx. 3 meters

1 Attach the lens to the camera.

At this stage, do not forget to connect the lens cable.

2 Set the lens aperture to manual and open the aperture.

3 Set the lighting in such a way that the appropriate video output level is achieved at a distance of about 3 meters away from the chart used for the flange back adjustment.

If the video level is too high, use the filters and shutter.

4 Loosen the screw securing the F.f (flange focus) ring.

<Note>

On some lenses, this may be marked as F.b (flange back) ring.

5 Set the zoom ring to the telephoto position either manually or electrically.

6 Shoot the chart used for the flange back adjustment, and turn the distance ring to adjust the focus.

7 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 during this process.

8 Repeat steps 5 to 7 until the focus is adjusted at both the telephoto and wide-angle positions.

9 Tighten the screw securing the F.f ring.

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