Canon eos rebel T2i - Manual (Page 61)

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d : Program AE
Change the ISO speed or use the built-in flash.
To match the subject and ambient lighting level, you can change the
ISO speed (p.62) or use the built-in flash (p.64). In the <d> mode,
the built-in flash will not fire automatically. So under low light, press
the <I> (Flash) button to pop up the built-in flash.
The program can be shifted. (Program shift)
After pressing the shutter button halfway, turn the <6> dial to
change the shutter speed and aperture setting combination
(program). After you take the picture, the program shift will be
canceled. Program shift is not possible with flash.
Shooting Tips
Differences Between <d> and <1> (Full Auto)
With <1>, many functions such the AF mode, drive mode, and built-in
flash are set automatically to prevent spoiled shots. The functions you can
set are limited. With <d>, only the shutter speed and aperture are set
automatically. You can freely set the AF mode, drive mode, built-in flash,
and other functions (p.210).
In very low light or very bright light, the shutter speed and
aperture display will blink when you press the shutter
button halfway, as shown in the figure. In low light (30"
3.5), either increase the ISO speed (p.62) or use flash
(p.64). In bright light (4000 22), decrease the ISO speed.
COP
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