Canon Speedlite 270EX Instruction Manual page 17

• Shutter sync. (1st curtain*/2nd curtain/High-speed)
- 1st curtain:
- 2nd curtain:
- High-speed:
• Flash exp. comp
You can adjust the flash output level in the same way as normal exposure
compensation.
• E-TTL II (Evaluative*/Average)
- Evaluative:
- Average:
[External flash C.Fn setting]
C.Fn-01: Auto power off (Enabled*/Disabled)
C.Fn-06: Quick flash w/continuous shot (Disabled*/Enabled)
Default settings are indicated by *.
This is the normal flash shooting mode in which the flash fires at the
timing when the shutter is fully open.
The flash fires right before the shutter closes.
This mode enables flash shooting at all shutter speeds. This is
effective when you want to use aperture priority for fill-flash
portraits.
Fully automatic flash shooting can be performed, from dark scenes
to fill-flash shooting.
Metering is averaged for the entire scene.
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