Canon EOS 90D Instruction Manual page 386

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Flash Function Settings
Flash mode
You can select the fl ash mode to suit your desired fl ash photography.
[CSP] (continuous shooting priority mode) is available when using a
compatible external Speedlite. This mode automatically reduces fl ash output
by one stop and increases ISO speed by one stop. Useful in continuous
shooting, and helps conserve fl ash battery power.
Regarding other fl ash modes, refer to the Instruction Manual of a Speedlite
compatible with the respective fl ash mode.
Adjust exposure compensation ( = 160) as needed in case of overexposure
o
from fl ash photography with [CSP] in < s > or < a > mode.
With [CSP], ISO speed is automatically set to [Auto].
o
174
[E-TTL II] is the standard mode of EL/
EX series Speedlites for automatic fl ash
photography.
[Manual fl ash] is for setting the Speedlite's
[Flash output] yourself.

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