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Adjusting the lens flange back
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.
Adjustment method
Note
For details on the adjustment method and positions of the lens parts, refer also to the instructions that accompany the lens.
About 3 metres
1
Mount the lens on the camera. Do not forget to connect
the lens cable at this time.
2
Set the lens iris to manual, and open the iris.
3
Set the lighting in such a way that the appropriate video
output level is obtained at a distance of about metres
from the flange back adjustment chart.
If the video level is too high, use a filter or shutter.
4
Loosen the screw that secures the F.f (flange focus)
ring.
Note
Depending on the lens concerned, this ring may be
marked as the "F.b" (flange back) ring.
14
5
Set the zoom ring to the telephoto position either by
manual or electrical means.
6
Shoot the flange back adjustment chart, 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.
8
Repeat steps 5 to 7 until the chart is focused properly
at both the telephoto and wide-angle positions.
9
Tighten up the screw that secures the F.f ring.
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