Canon EOS R10 User Manual page 153

2.
Focus on the subject.
3.
Press the <
Center the subject on the screen, then press the <
A preflash is fired by the flash, and the flash output required for
shooting is retained.
[ ] appears briefly on the screen, and [
Each time you press the <
output required for shooting is retained.
4.
Take the picture.
Compose the shot and press the shutter button completely.
> button ( ).
> button, a preflash is fired, and the flash
153
> button.
] is lit.