Canon Speedlite 270EX II - Manual (Page 17)

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• Shutter sync. (1st curtain*/2nd curtain/High-speed)
- 1st curtain: This is the normal flash shooting mode in which the flash fires at the
timing when the shutter is fully open.
- 2nd curtain: The flash fires right before the shutter closes.
- High-speed: This mode enables flash shooting at all shutter speeds. This is
effective when you want to use aperture priority for fill-flash
portraits.
• Flash exp. comp
You can adjust the flash output level in the same way as normal exposure
compensation.
• E-TTL II (Evaluative*/Average)
- Evaluative: Fully automatic flash shooting can be performed, from dark scenes
to fill-flash shooting.
- Average: Metering is averaged for the entire scene.
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