Canon eos rebel T2i - Manual (Page 59)

59
Creative Shooting
In the Basic Zone modes, to prevent spoiled shots,
most functions are set automatically and cannot be
changed. In the <d> (Program AE) mode, you can set
various functions and be more creative.
In the <d> (Program AE) mode, the camera sets the
shutter speed and aperture automatically to obtain a
standard exposure.
The difference between the Basic Zone modes and <d> is
explained on page 210.
* <d> stands for Program.
* AE stands for Auto Exposure.
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