Sony DXC-637 - Camera Adjustments and Settings; White Balance Adjustment

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Adjustments and Settings
Adjusting the white balance ensures that as lighting
conditions change white objects remain white in the
image and tones remain natural.
The color of light emitted varies from one light source
to another, and as the lighting changes the apparent
color of an illuminated subject changes. It is therefore
necessary to adjust the white balance each time the
principal lighting source changes.
Saving an appropriate white balance value
in memory
You can save two white balance values in separate
memories, A and B. Unless changed, the saved values
are retained for approximately ten years, even when
the camera is powered off.
Once a value is saved, you can automatically restore
the adjustment by moving the WHITE BAL switch to
the A or B position. This makes shooting under
alternating lighting conditions easy.
Separate white balance values for each
FILTER control setting
In the default case, as described above, the same two A
and B white balance values apply to alt settings of the
FILTER control. It is possible, however, to change the
AWB MEM menu setting (see page 40) so that there
are eight possibly different values for each of the A
and B positions and for the four FILTER control
settings.
1 Make the following settings on the camera.
* POWER switch: ON SAVE
@ OUTPUT/DCC switch: one of the CAM
positions
Lens iris selector: A (automatic)
e@ ATW button: off
2 Set the FILTER control according to the lighting
conditions. (See page 31.)
3 Set the WHITE BAL switch to A or B.
4 Arrange a white subject (paper, cloth, etc.) under
the same lighting conditions as for shooting, and
zoom in on it so that as far as possible the whole
screen is white.
The minimum white area requirements for the
adjustment are shown in the following figure.
{Shoutd be no highlights within the area of the ellipse.)
Center of the screen and
of the ellipse x
Area of white within this ellipse
should be equivalent to at least
10% of the image area.
Minor axis: approximately Major axis: approximately
80% of the height of the 80% of the width of the
image image
5 push the WHT/BLK switch in the WHT direction
and release.
The white balance adjustment is carried out.
During the adjustment the legend “AUTO WHITE
-OP-” appears in the viewfinder.
After a few seconds the adjustment is complete,
and the legend in the viewfinder changes to
“AUTO WHITE -OK-” plus a color temperature,
as shown in the following figure.
AUTO. WHITE
-OK-
3200K
(Continued)
43
44
Adjustments and Settings
The adjustment value is automatically saved in
memory A or B as selected above.
To save the white balance adjustment for different
lighting conditions, repeat steps 2 to 4 above. You can
save two different values for the white balance, in
memories A and B.
¢ When using a camera control unit, if the W/B
BALANCE switch of the camera control unit is set
to PRESET or MANUAL, it is not possible to carry
out white balance adjustment on the camera.
« When using a CCU-M5/MS5P Camera Control Unit,
make sure that the MODE switch of the CCU-M5/
MSP is in the CAM position.
To recail a white balance value from memory
Before beginning shooting, set the WHITE BAL
switch to the A or B position. This automatically sets
the camera to the white balance adjustment saved in
the corresponding memory.
If white balance adjustment cannot be
completed automatically
The warning message “AUTO WHITE -NG-” appears
in the viewfinder.
Make the necessary corrections, then carry out the
process again.
Warning messages for white balance adjustment
-NG-
LOW LIGHT
TRY AGAIN
Light level is too low.
Increase the illumination level, open
the iris, or use the GAIN switch to
increase the video signal level.
« Check the setting of the FILTER
control.
e After these checks, retry the
adjustment.
AUTO WHITE
-NG-
2?
TRY AGAIN
The subject is not white, or the lighting
level is too high.
e Use a white subject.
Lower the illumination level, stop down
the iris, or use the GAIN switch to
decrease the video signal level.
« Check the setting of the FILTER
control.
« After these checks, retry the
adjustment.
AUTO WHITE
-NG-
:C.TEMP.LOW
CHG.FILTER
TRY AGAIN
The color temperature is too low. Try the
following, in this order of precedence.
(1) Ifthe FILTER control is in position 3
or 4, change it to position 1 or 2, then
retry the adjustment.
(2) Check that the subject is completely
white, then retry the adjustment.
(3) The color temperature may be
outside the range of the camera. Fit
an appropriate color temperature
conversion filter, then retry the
adjustment.
AUTO WHITE
-NG-
:C.TEMP.HI
CHG.FILTER
TRY AGAIN
The color temperature is too high. Try
the following, in this order of precedence.
(1) If the FILTER control is in position 1
or 2, change it to position 3 or 4, then
retry the adjustment.
(2) Check that the subject is completely
white, then retry the adjustment.
(3) The color temperature may be
outside the range of the camera. Fit
an appropriate color temperature
conversion filter, then retry the
adjustment.
WHITE:PRESET
The WHITE BAL switch is in the
PRESET position.
Move the WHITE BAL switch to the A or
B position.
BARS
The camera is outputting a color bar
signal.
Move the OUTPUT/DCC switch to one of
the CAM positions.
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