Canon EOS 77D, Instruction Manual, Page: 221 / 502

221
Using an EX-series Speedlite (sold separately) makes flash
photography easy.
For operation procedures, refer to the EX-series Speedlite’s
Instruction Manual.
This camera is a Type-A camera that can use all
the features of EX-series Speedlites.
To set the flash functions and flash Custom Functions on the camera’s
menu screen, see pages 223-228.
D
Using an External Speedlite
EOS-dedicated, EX-series Speedlites
Shoe-mount Speedlites Macro Lites

With an EX-series Speedlite not compatible with the flash function
settings (p.223), only [
Flash exp. comp ] and [ E-TTL II meter. ] can be
set for [ External flash func. setting ]. ([ Shutter sync. ] can also be set
with certain EX-series Speedlites.)

If flash exposure compensation is set with the external Speedlite, the
flash exposure compensation icon displayed on the camera’s LCD
monitor will change from
y
to
0
(when [
s
: Shooting screen ] is set
to [ Standard ]).