Canon HD XS HJ15ex8.5B Operation Manual page 45

LENSES
4 ADJUSTMENT
4-1. BACK FOCUS ADJUSTMENT OF THE LENS
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.
Siemens star chart
Flange Back
Adjusting Ring
Loosening
Flange Back
Lock Screw
Flange Back
Lock Screw
Tightening
1
Select an object at an appropriate distance (2 to 5
meters recommended).
A Siemens star chart is preferable for this
adjustment. If no such chart is available, use any
object that offers sharp contrast to facilitate the
adjustment work.
2
Set the iris fully open.
3
Set the lens to the telephoto angle by turning the
zoom ring.
4
Bring the object into focus by turning the focus
ring.
5
Set the lens to the widest angle by turning the zoom
ring.
6
Loosen the flange back lock screw, and turn the
flange back adjusting ring to bring the object into
focus.
7
Repeat steps 3 to 6 a few times until the object is
brought into focus at both the widest angle and
telephoto ends.
8
After making sure that the object is in sharp focus,
tighten the flange back lock screw.
The adjustment procedure is now completed.
Refer to "5 OPERATION" as for details on
zooming, focusing, and iris operation performed
with the back focus adjustment.
E11 E11
4 ADJUSTMENT