Shooting with the AE Lock
You can lock the exposure and shoot, or set the focus and exposure separately to shoot. AE stands for “Auto Exposure”.
Lock the exposure.
z Point the camera toward the subject and
press the bbutton while pressing the shutter button halfway.
XWhen 
appears, the exposure will be locked.
zIf you release your finger from the shutter
button and press the b button again, 
will disappear and AE will unlock.
Compose the scene and shoot.
zWhen you shoot one image, 
will disappear and AE will unlock.
Program Shift
If you lock the exposure and turn the 5dial, you can change the shutter speed and aperture value combination.
Shooting with the FE Lock
Just as with the AE lock (see above), you can lock the exposure for shooting with the flash. FE stands for “Flash Exposure”.
Choose h (p. 74).
Lock the flash exposure.
z Point the camera toward the subject and
press the bbutton while pressing the shutter button halfway.
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