Nikon Digital Camera, Reference Manual

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123
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 (
0
151; the default is 30 s).
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; if
M Manual is selected for Exposure mode , adjust
exposure so that the exposure indicator shows ±0 (
0
111).
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 5,000–5,500 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 follow-
ing color temperatures:
• Sodium-vapor lamps : 2,700 K
•
J
(incandescent) /
Warm-white fluorescent : 3,000 K
•
White fluorescent
:
3,700 K
• I
Cool-white fluorescent
:
4,200 K
• Day white fluorescent : 5,000 K
•
H
(direct sunlight) : 5,200 K
•
N
(flash) : 5,400 K
•
G
(cloudy) : 6,000 K
•
Daylight fluorescent
:
6,500 K
•
Mercury-vapor lamps
:
7,200 K
•
M
(shade) : 8,000 K