Canon Speedlite 430EX III-RT - Manual (Page 25)

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The FE (Flash Exposure) lock locks the correct flash exposure setting
for any part of the scene.
While <
a > is displayed on the LCD panel, press the camera’s
< B > button. For cameras without a < B > button, press the
< A > (AE lock) or < 7 > button.
1
Focus on the subject.
2
Press the < B > button. ( 8 )
With the subject at the center of the
viewfinder, press the camera’s
<
B > 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 approx. 0.5 sec.
Each time you press the < B >
button, a preflash will be fired and the
new flash output required at that time
is retained in memory.
7 : FE Lock
N
If a correct exposure cannot be obtained when FE lock is performed,
<
Q > blinks in the viewfinder. Move closer to the subject or open the
aperture, and perform FE lock again. You can also set a higher ISO
speed and perform FE lock again when using a digital camera.
If the target subject is too small in the viewfinder, FE lock may not be
effective.