Back Focus Adjustment; Iris Gain Adjustment - Canon HD XS HJ14ex4.3B Operation Manual

3 ADJUSTMENT
3 ADJUSTMENT

3-1. BACK FOCUS ADJUSTMENT

If the relationship between the image plane of the lens and the image plane of the television camera is
incorrect, the object goes out of focus when the lens is zoomed. Follow the procedure below to adjust
the back focus of the lens.
Extender Lever
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 at middle
of range at the factory. However, if you wish to change the iris gain, adjust the trimmer using a small
screwdriver.
Iris Operation Mode
Change-over Switch
Clockwise
(to increase gain)
This adjustment can be performed on the information display. Refer to the Information Display Manual.
Flange Back Lock Screw
Loosening
18
HJ18ex7.6B IASE S
Iris Gain Adjusting
Trimmer
Rubber Cap
1
Select an object at an appropriate distance (HJ14ex: approx.
1 to 3m, HJ17ex/HJ18ex7.6B/HJ21ex/HJ24ex/KJ10ex/
KJ17ex/KJ22ex: approx. 2 to 5m, HJ18ex28B: approx. 5 to
7m recommended). Use any object with sharp contrast to fa-
cilitate the adjustment work.
2
Set the extender lever to 1x.
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 both at the widest end and the telephoto end.
9
Tighten the flange back lock screw.
1
Pull up the rubber cap on the iris gain adjusting trimmer.
2
Set the iris operation mode change-over switch to the "A"
(Auto) position.
3
Turn the iris gain adjusting trimmer, using a small
screwdriver. As you look at the lens iris ring, set it to the
position of maximum gain at which no iris hunting occurs.
4
Close the rubber cap after adjustment completes.
E4