Back Focus Adjustment - JVC GY-DV5100U User Manual

6-5 Back Focus Adjustment

3. 4. 6.
RET
W
Siemens star chart
6. SETTING AND ADJUSTMENTS BEFORE SHOOTING
5.
M
A
T
1.
2. 7. 8. 10.
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.
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 M (Manual).
3.
Open the iris by turning 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.
MEMO:
ACCU FOCUS can also be used in the above step 3 .
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