Adjusting the Lens

Flange Focal Length Adjustment

It is necessary to adjust the flange focal length (the

• When a lens is fitted for the first time

distance from the lens flange to the plane of the image

• After changing lenses

along the optical axis) in the following cases.

• 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

 

 

 

Flange focal length

 

 

 

 

 

 

 

 

adjustment test chart

 

 

T

A

 

RET

W

M

IRIS

 

 

 

 

 

 

 

 

 

8

6

7

5

ZOOM

SERVO MANU.

1 Set the iris selector to the M position.

2 Turn the iris ring to f/1.8 (fully open).

3 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.

4 Loosen the F.B fixing screw.

5 Set the ZOOM selector to the MANU. position.

6 Move the manual zoom control to the telephoto position.

7 Turn the focusing ring so that the test chart is in focus.

8 Move the manual zoom control to the wide angle position.

9 Turn the F.B adjustment 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 F.B fixing screw.

Settings and Adjustments 5 Chapter

Chapter 5 Adjustments and Settings

89