Flash photography, Fe lock, 220) is recommended – Canon EOS RP Mirrorless Camera User Manual
Page 220: El/ex series speedlites for eos cameras, Z flash exposure compensation, Z fe lock

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Flash Photography
EL/EX Series Speedlites for EOS Cameras
Using an EL/EX series Speedlite (sold separately) makes flash photography
easy.
For operation procedures, refer to the EL/EX series Speedlite’s
Instruction Manual.
This camera is a Type-A camera that can use all the
features of EL/EX series Speedlites.
To set the flash functions and flash Custom Functions on the camera’s
z
Flash exposure compensation
You can adjust flash output (flash exposure compensation). With an
image displayed on the screen, press the <
B
> button, turn the <
5
>
dial to select the flash exposure compensation item, then turn the <
6
>
dial to set the flash exposure compensation. You can set flash exposure
compensation up to ±3 stops in 1/3-stop increments.
z
FE lock
This enables you to attain an appropriate flash exposure for a specific
part of the subject. Aim the viewfinder center over the subject, press the
camera’s <
A
> button, then compose the shot and take the picture.
o
Even if you set negative flash exposure compensation (to keep images
darker), bright images may still be captured unless
[
z
: Auto Lighting
Optimizer]
[Disable]
.
o
You can adjust the flash exposure compensation with Quick Control (
or with
[Flash function settings]
under
[
z
: External Speedlite control]
(
o
The camera can turn on certain Speedlites automatically when the camera
is turned on. For details, refer to the instruction manual of Speedlites that
support this feature.