Canon Speedlite 430EX II - Manual (Page 16)

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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 fires a preflash, then
the required flash output 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 reading 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 target subject is too small in the viewfinder, the FE lock might not
be very effective.
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