Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 174)

174
Using an External Speedlite
EOS-dedicated, EL/EX-series Speedlites
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.
z Functions are limited when using EX series Speedlites that are not
compatible with flash function settings.
z Non-EL/EX series Canon Speedlites will not fire.
z If the camera is used with a flash unit or flash accessory dedicated to another
camera brand, the camera not only may not operate properly, but malfunction
may result.