Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 117)

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If the subject is on the side of the frame and you use flash, the subject
may turn out to be too bright or dark depending on the background, etc.
This is when FE lock is effective. After setting the proper flash exposure
for the subject, you can recompose (put the subject toward the side)
and shoot. This feature can also be used with a Canon EX-series
Speedlite.
* FE stands for Flash Exposure.
1 Press the <D> button.
X
The built-in flash will rise.
Press the shutter button halfway and
look in the viewfinder to check that
the <D> icon is lit.
2 Focus on the subject.
3 Press the <A> button. (8)
Aim the viewfinder center over the
subject where you want to lock the flash
exposure, then press the <A> button.
X
The flash will fire a preflash and the
required flash output is calculated
and retained in memory.
X
In the viewfinder, “FEL” is displayed
for a moment and <d> will light up.
Each time you press the <A> button,
a preflash is fired and the required
flash output is calculated and retained
in memory.
4 Take the picture.
Compose the shot and press the
shutter button completely.
X
The flash is fired when the picture is
taken.
A Locking the Flash ExposureN
COP
Y