Sony DXC-637 - Black Balance Adjustment

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Using the preset white balance settings
The camera provides two preset white balance settings,
for instant shooting with approximately the correct
adjustment.
There are also particular shooting conditions under
which the preset values may give better results than the
human eye adjustment.
1 Set the WHITE BAL switch to PRESET.
2 Set the FILTER control.
The white balance is automatically adjusted for
3200 K when the FILTER control is in position 1
or 2, and for 5600 K in position 3 or 4.
Hints on white balance adjustment
Light sources and color temperature
Adjustment of the white balance to match the light
source is essential to ensure correct color rendering.
The color of a light source is indicated as a color
temperature in kelvins (K). It is higher for bluish light,
and lower for reddish light. When the camera is
shipped it is adjusted for use with video lights (halogen
lights with a color temperature of 3200 K). For use
with other light sources, therefore, adjustment is
required,
First use the FILTER control to set the approximate
color temperature, then carry out white balance
adjustment.
The following table shows typical color temperature
values for different light sources.
Color temperatures of different light sources.
10,000 Clear sky
Light cloud 8,000
Cloudy or rainy Blue fight 7,000
skies 6,000
Fluorescent light 5,000
(daylight white)
Direct suntight, Mercury lighting
noon Fluorescent light | White light
(white)
One hour after
sunrise or before | Fluorescent light 4,000
sunset
{warm
white)
3,500
Studio
lighting
3,200
Halogen
lamps
Yellow
light
3,000
and
video
lights
2,500
Thirty minutes Incandescent
after sunrise or —_| fighting
before sunset Sodium street-
lighting
Candlelight
Sunrise of sunset Redlight 2,000
Using the ATW (Auto Tracing White
balance) function
The ATW function continuously adjusts the white
balance automatically to adapt to changes in lighting
conditions.
Depending on the shooting conditions, automatic
adjustment may not necessarily give optimum results.
For the best possible results, use the WHITE BAL
switch.
To use the ATW function
Press the ATW button turning the indicator on.
This activates the ATW function, and the ATW
indication appears in the viewfinder.
To disable the ATW function, press the ATW button
again, turing the indicator off.
if the ATW function does not operate correctly
A warning indication appears in the viewfinder. (See
page 44.)
45
46
Adjustments and Settings
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Correct adjustment of the black balance is important
for optimum operation of a video camera. It is
necessary when using the camera for the first time or
after a significant period out of use, and also when
there has been a sudden change in temperature.
The adjustment value is saved in memory, and
readjustment is not normally necessary after powering
the camera off or simply when lighting conditions
change.
1 Move the POWER switch to the ON SAVE
position, and check that the OUTPUT/DCC switch
is in one of the CAM positions.
2 Push the WHT/BLK switch in the BLK direction
and release.
The lens iris closes, and black balance adjustment
is carried out.
During the adjustment the legend “AUTO BLACK
-OP-” appears in the viewfinder.
AUS BACK
After a few seconds the adjustment is complete,
and the legend in the viewfinder changes to
“AUTO BLACK -OK-”.
¢ When using 2 camera contro! unit, if the W/B
BALANCE switch of the camera control unit is set
to MANUAL, it is not possible to carry out black
balance adjustment on the camera.
e When using a CCU-M5/M5P Camera Control Unit,
make sure that the MODE switch of the CCU-M5/
MSP is in the CAM position.
If black balance adjustment cannot be
compteted automatically
The warning message “AUTO BLACK -NG-” appears
in the viewfinder.
Make the necessary corrections, then carry out the
process again.
Warning messages for black balance adjustment
AUTO BLACK
: IRIS
NOT CLOSED
TRY AGAIN
AUTO BLACK
-NG-
: 22
TRY AGAIN
The lens iris did not close fully.
Check whether the lens cable is
connected properly, and whether there is
a fault in the lens. Ifa second attempt to
carry out the adjustment fails, consult
your Salas representative or supplier.
The iris opened during adjustment or
there is a hardware error.
Close the irls and try again. If this fails,
consult your sales representative or
supplier.
The camera is outputting a color bar
signal.
Move the OUTPUT/DCC switch to one of
the CAM positions.