Canon Speedlite 90EX Instruction Manual - Page 16
Flash C.Fn settings] - wireless
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• Shutter sync. (1st curtain*/2nd curtain) - 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. • 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. • Wireless functions (Off*/Optical transmission) (p.15) • Optical channel (1* to 4) • Flash group (ALL, A:B, A:B C) • Group exposure compensation (A, B, C) • Ratio control (8:1 - 1:8, 1/2-stop increments) [Flash C.Fn settings] 1: Auto power off (Enabled*/Disabled) 14