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III. DISCUSSION 15
Controls
F
or a custom WB setting, first take a picture of a white subject serving as the white
b
alance
s
tandard. Then, set the custom WB mode on the onscreen menu and specify
th
at image.
In a s
ubstantial upgrade from the EOS Digital Rebel camera, the flash color data
tr
ansmission function from the EOS 20D enables the built-in flash or an accessory
S
peedlite 580EX to provide flash color information which is used in exposure
calculation when the white balance is set to “AWB” or “Flash.”
The EOS Digital Rebel XT camera shares its white
balance correction and bracketing functions with the
EOS-1D Mark II, EOS-1Ds Mark II and EOS 20D. Both
the blue/amber and the magenta/green biases can be
set up to +/- 9 levels. The user can correct or change
the color temperature for the white balance mode
currently set. One can therefore obtain the same effects
usually provided by color temperature conversion filters
or color correction filters. Blue/amber and
magenta/green corrections can be set in combination.
The setting screen is the same as the EOS 20D’s, but
the setting operation differs. The cross keys set the
desired white balance correction and the electronic dial
sets the bracketing.
In addition to the blue/amber bracketing offered in the EOS Digital Rebel camera, the
EOS Digital Rebel XT camera also provides magenta/green bracketing. Either range, but
not both, may be set. When the shutter is released, three images are created, each with
a different bias setting in a range of up to +/- 3 levels in 1-level increments. White
balance correction and auto exposure bracketing (AEB), can be set in combination with
WB-BKT. When AEB and WB-BKT are combined, a total of 9 images will be saved to the
CF card. WB-BKT does not work during RAW and RAW + JPEG shooting, since white
balance settings can be adjusted during post-processing with the supplied software.
Along with its new 8-megapixel sensor, one of the biggest differences between the EOS
Digital Rebel XT camera and its predecessor, the EOS Digital Rebel camera, is its system
of controls and preferences. Of course, the camera can be operated in a fully automatic
mode so that it can be use by inexperienced
photographers. After brief experience with the
exceptional quality of the images the XT camera
produces, there is every expectation that the vast
majority of XT camera users will explore, and
inevitably find indispensable, the many ways in
which the camera can be made to do exactly what
the user wishes. It is a delight to use such a tool.
White fluor
escent light
Blac
kbody
radial locus
Tun
gsten
light bulb
Daylight
0.8
0.6
0.4
0.2
0
0.2 0.4 0.6 0.8
CIE
xy color graph
B: Blue
A: Amber
G:
Green
M: Magenta
Manual exposure
Shutter-priority AE
Aperture-priority AE
Program AE
Full Auto
Portrait
Landscape
Close-up
Sports
Night portrait
Auto Depth-of-Field AE
Flash Off