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 displayed on the LCD panel, you press the camera’s
<7> button. If the camera does not have the <7> button, press the
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 icon
will blink in the viewfinder. Move closer to the subject and try the FE lock
again.
If 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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