Canon EOS Rebel XT - Manual (Page 148)

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Custom Function Settings
N
C.Fn-1 SET button/Cross keys funct.
You can change the function assigned to the <
0> button and <S>
keys for shooting.
0: Normal
1: SET:Quality
When you press <
0>, the [z Quality] menu appears so you
can quickly change the setting.
2: SET:Parameter
When you press <
0>, the [m Parameters] menu appears so
you can quickly change the setting.
3: SET:Playback
When you press <
0>, the images recorded in the CF card will be
played. Assigns the same function as the <
x> button.
4: Cross keys:AF frame selec.
At first, you can just use the <
S> keys to select an AF point directly
without pressing the <
S> button. To set automatic AF point selection,
press the <
S> button. Also, to select the center AF point, press <0>.
C.Fn-2 Long exposure noise reduction
0: Off
1: On
Reduces noise in bulb exposures 30 sec. or longer at ISO 100 -
800 or 1 sec. or longer at ISO 1600. After the picture is taken, the
time required for noise-reduction processing will be the same as
the exposure time. During the noise reduction processing, “buSY”
will be displayed and shooting will not be possible.
C.Fn-3 Flash sync. speed in Av mode
0: Auto
1: 1/200sec. (fixed)
Sets the flash sync speed to 1/200 sec. in the aperture-priority AE
(Av) mode. (Against dark backgrounds such as the night sky, the
subject’s background will look dark.)