Canon Speedlite 580EX II - Manual (Page 17)

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FE (flash exposure) lock locks the correct flash exposure setting for any
part of the scene.
With <a> displayed on the LCD panel, you press the camera’s
<7> button. If the camera does not have the <7> button, press the
<P> button.
1 Focus the subject.
2
Press the <7> button. (3)
Aim the subject at the center of the
viewfinder and press the <7>
button.
X The Speedlite will fire a preflash and
the required flash output for the
subject is retained in memory.
X “FEL” will be displayed in the
viewfinder for 0.5 sec.
Each time you press the <7>
button, a preflash will be fired and a
new flash exposure setting will be
locked.
7: FE Lock
If the subject is too far away and underexposure will result, the <Q> icon
will blink in the viewfinder. Move closer to the subject and try the FE lock
again.
If <a> is not displayed on the LCD panel, FE lock cannot be set.
If the subject is too small, FE lock might not be very effective.
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