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Chapter 5 Adjustments and Settings 133
Chapter 5 Adjustments and Settings
4,11 2 1 3
Adjusting the Lens
Flange Focal Length Adjustment
It is necessary to adjust the flange focal length (the
distance from the lens flange to the plane of the image
along the optical axis) in the following cases.
• When a lens is fitted for the first time
• After changing lenses
• When during zoom operations the focus does not
match properly from telephoto to wide angle
1 Set the IRIS selector to the M position.
2 Turn the iris ring to open it.
3 Place the supplied flange focal length adjustment
test chart at a range of about 3 meters (10 feet), and
adjust the light so that an appropriate video output
level is obtained with the iris open.
4 Loosen the F.B fixing knob.
5 Set the ZOOM selector to the MANU. position.
6 Turn the zoom ring to the telephoto position.
7 Turn the focus ring so that the test chart is in focus.
8 Turn the zoom ring to the wide angle position.
9 Turn the F.B fixing ring so that the test chart is in
focus. Do not move the focusing ring.
10Repeat steps 6 to 9 until the image stays in focus
from telephoto to wide angle.
11After adjustment, tighten the screw of the F.B
About 3 m (10 feet)
Flange focal length
adjustment test chart