Canon Speedlite 600EX II-RT Manual (en)

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The FE (Flash Exposure) lock locks the correct flash exposure setting 
for any part of the subject.
With <a> 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 LockN
 
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.