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Text excerpt from page 89 (click to view)
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.
W
� 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
4,11
2
1
3
About 3 m (10 feet)
9
A M
Flange focal length adjustment test chart
T
IR IS
R E T
8
6
75
ZOOM SERVO MANU.
1 2 3
Set the iris selector to the M position. Turn the iris ring to f/1.8 (fully open). Place the supplied flange focal length adjustment test chart at a range of about 3 meters (10 feet), and adjust the lighting so that an appropriate video output level is obtained with the iris at f/1.8. Loosen the F.B fixing screw. Set the ZOOM selector to the MANU. position. Move the manual zoom control to the telephoto position.
7 8 9
Turn the focusing ring so that the test chart is in focus. Move the manual zoom control to the wide angle position. Turn the F.B adjustment ring so that the test chart is in focus. Do not move the focusing ring.
Chapter 5 Adjustments and Settings
4 5 6
10Repeat steps 6 to 9 until the image stays in focus
from telephoto to wide angle.
