171
i
D
Auto Power Off
White balance measurement will end without a new value being
acquired if no operations are performed for the time selected for
Auto
power off
in the setup menu (
197; the default is 1 minute).
D
Preset White Balance
The camera can store only one value for preset white balance at a time;
the existing value will be replaced when a new value is measured. Note
that exposure is automatically increased by 1 EV when measuring
white balance; in mode
M
, adjust exposure so that the exposure indica-
tor shows ±0 (
A
Color Temperature
The perceived color of a light source varies with the viewer and other
conditions. Color temperature is an objective measure of the color of a
light source, defined with reference to the temperature to which an
object would have to be heated to radiate light in the same wave-
lengths. While light sources with a color temperature in the neighbor-
hood of 5000–5500 K appear white, light sources with a lower color
temperature, such as incandescent light bulbs, appear slightly yellow
or red. Light sources with a higher color temperature appear tinged
with blue. The camera white balance options are adapted to the fol-
lowing color temperatures (all figures are approximate):
•
Sodium-vapor lamps
:
2700 K
•
J
(incandescent)
/
Warm-white fluorescent
:
3000 K
•
White fluorescent
:
3700 K
•
I
(cool-white fluorescent
):
4200 K
•
Day white fluorescent
:
5000 K
•
H
(direct sunlight)
:
5200 K
•
N
(flash)
:
5400 K
•
G
(cloudy)
:
6000 K
•
Daylight fluorescent
:
6500 K
•
Mercury-vapor lamps
:
7200 K
•
M
(shade)
:
8000 K
