6. SETTING AND ADJUSTMENTS BEFORE SHOOTING
46
6-5 Back Focus Adjustment
It is only necessary to perform this when the lens is attached
for the first time or when focusing is not correct in both the
telephoto and wide-angle positions. Adjust the viewfinder for
sharpness first.
It is easier to adjust back focus when the subject is more
than 3 meters from the camera.
The optimal subject for this adjustment is a Siemens star
chart.
1.
Set the IRIS mode switch to M (Manual).
2.
Set the zoom mode to MANU (Manual).
3.
Open the iris ring. If the illumination is too strong, reduce it
or move to a darker place.
4.
Turn the zoom lever until the lens is at the maximum
telephoto position.
5.
Bring the subject into focus.
6.
Set the lens to maximum wide-angle.
7.
Loosen the back focus ring retaining knob.
8.
View the same subject and adjust the back focus ring for
the best possible focus.
9.
Repeat steps
4.
through
8.
about three times for fine
adjustment until the subject remains in focus in both the
telephoto position and the wide-angle position.
10.
Tighten the back focus ring retaining knob to secure the
ring.
Siemens star chart
ACCU FOCUS can also be used in the above step
3
.
Memo:
M
RET
W
T
A
MACRO
4.
6.
5.
3.
1.
7.
8.
10.
2.
