Canon EOS Rebel XTI - Manual (Page 54)

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In indoors, low light, or backlit conditions, just pop-up the built-in flash and press
the shutter button to take flash pictures. In the <d> mode, the shutter speed
(1/60 sec. - 1/200 sec.) will be set automatically to prevent camera shake.
1
Press the <D> button.
In Creative Zone modes, you can
press the <D> button anytime to take
flash pictures.
While the flash is recycling, “DbuSY”
is displayed in the viewfinder, and
[BUSYD] is displayed on the upper
left of the LCD monitor.
2
Press the shutter button halfway.
In the bottom left of the viewfinder,
check that the <D> icon is lit.
3
Take the picture.
When focus is achieved and you
press the shutter button completely,
the flash will fire for the picture.
Effective Flash Range
[Approx. in meters / feet]
Using the Built-in Flash
ISO
speed
EF-S18-55mm f/3.5-5.6 II EF-S17-85mm f/4-5.6 IS USM
Wide angle: 18mm Telephoto: 55mm Wide angle: 17mm Telephoto: 85mm
100 1 - 3.7 / 3.3 - 12.1 1 - 2.3 / 3.3 - 7.5 1 - 3.3 / 3.3 - 10.8 1 - 2.3 / 3.3 - 7.5
200 1 - 5.3 / 3.3 - 17.4 1 - 3.3 / 3.3 - 10.8 1 - 4.6 / 3.3 - 15.1 1 - 3.3 / 3.3 - 10.8
400 1 - 7.4 / 3.3 - 24.3 1 - 4.6 / 3.3 - 15.1 1 - 6.5 / 3.3 - 21.3 1 - 4.6 / 3.3 - 15.1
800 1 - 10.5 / 3.3 - 34.4 1 - 6.6 / 3.3 - 21.7 1 - 9.2 / 3.3 - 30.2 1 - 6.6 / 3.3 - 21.7
1600 1 - 14.9 / 3.3 - 48.9 1 - 9.3 / 3.3 - 30.5 1 - 13.0 / 3.3 - 42.7 1 - 9.3 / 3.3 - 30.5
If you shoot 20 images with flash at short intervals, the flash might stop
operating. This is to protect the flash unit. If you press the shutter button halfway
and “DbuSY” is displayed in the viewfinder (and [BUSYD] on the LCD
monitor), wait until the display turns off. You can then use flash again.