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3 ADJUSTMENT
3-1. BACK FOCUS ADJUSTMENT OF THE LENS
If the relation between the image plane of the lens and the image plane of the camera is incorrect, the object
goes out of focus at the time of zooming operation. Follow the procedure below to adjust the back focus of
the lens.
Extender Lever
(Only models with built-in extender)
Flange Back
Adjusting
Ring
3-2. IRIS GAIN ADJUSTMENT
An iris gain adjusting trimmer is located on the front of the lens drive unit. The iris gain is set appropriately
at the factory. However, if you wish to change the iris gain, adjust the trimmer through the procedure
described below.
Iris Operation Mode
Change-over Switch
Clockwise
(to increase gain)
The adjustment and the setting can also be made on the information display. Refer to "Information Display
Manual" in the supplied CD-ROM.
Loosening
Flange Back
Lock Screw
Iris Gain Adjusting
Trimmer
Rubber Cap
1
Select an object at an appropriate distance (CN7x17 :
approx. 1.5 to 3m, CN10x25 : approx. 2 to 5m recom-
mended). Use any object with sharp contrast to facilitate the
adjustment work.
2
Set the extender lever to 1x.
(Only models with built-in extender)
3
Set the iris fully open.
4
Set the lens to the telephoto angle by turning the zoom
ring.
5
Bring the object into focus by turning the focus ring.
6
Set the lens to the widest angle by turning the zoom ring.
7
Loosen the flange back lock screw, and turn the flange back
adjusting ring to bring the object into focus.
8
Repeat steps 4 to 7 a few times until the object is brought
into focus at both the widest angle and telephoto ends.
9
Tighten the flange back lock screw.
1
Set the iris operation mode change-over switch to the "A"
position.
2
Pull up the rubber cap on the iris gain adjusting trimmer.
3
Turn the iris gain adjusting trimmer, using a small
screwdriver to set the level as desired.
To determine the maximum gain, set the trimmer at a level
where no hunting occurs.
4
Put back the rubber cap after adjustment completes.
E9
3 ADJUSTMENT
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