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r_a,d¢_stem white balance
Spot metering area
Custom-white-balance
function allows the camera to be
calibrated to a specific lighting condition. With the white
balance dial in the custom position, press the white-balance
button to open the setting screen.
A guidance
message appears. If the shutter-release
button is
pressed partway down, the monitor display returns. The red
custom set indicator is displayed
in the white-balance
panel.
Turn the white-balance
dial to another position to cancel the
routine.
Fill the spot metering area with a white or neutral object; the
object does not need to be in focus. Press the shutter-release
button all the way down to calibrate the camera.
An image of the reference target is displayed.
Press the central
button of the controller to complete
the operation.
A calibration error may occur under extremely bright light sources, especially with flash units. If an
error occurs, a message appears on the monitor and the white-balance
indicator
is yellow. Repeat
the procedure
by recalibrating
using a gray card as a reference target to reduce the intensity of the
illumination.
K cobt
temperature
Color temperature
Magenta/Green
compensation
White balance can be set to a known color temperature
of a
light source or set to the color temperature
determined
by a
color meter. With the white balance dial in the color
temperature
(K) position,
press the white-balance
button to
open the setting screen.
Use the left/right controller keys or control dial to
select among thousand ° K, hundred ° K, and
magenta/green
compensation.
Use the up/down
controller keys to adjust the value.
Press the central controller
button to complete
the
operation.
Color temperature
refers to the color of the light emitted from a blackbody
radiator at a specific
temperature
given in degrees Kelvin. This is an accurate way of measuring light from continuous-
spectrum
sources such as the sun and incandescent
or tungsten light bulbs.
However, color temperature
alone can be inaccurate
with discontinuous-spectrum
sources such as
fluorescent.
The magenta/green
compensation
scale allows adjustments
to compensate
for this
problem. The increment on the scale is equivalent to approximately
5CC; M3 would be 15CC
magenta.
For information
on light sources, see page 69.
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