Canon Speedlite 600EX-RT Instruction Manual - Page 38
Flash External Metering - - external flash
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//.: Flash External Metering The Speedlite's built-in external metering sensor measures the flash reflected from the subject in real time, and stops the flash when the standard exposure is reached. "Auto external flash metering" can be used with the EOS digital cameras released since 2007. "Manual external flash metering" can be used with all EOS cameras. /: Auto External Flash Metering This enables you to perform automatic flash shooting. The flash output is automatically adjusted according to the ISO speed and aperture set in the camera. Set the flash mode to . Press the button and set to . If is not displayed, set the flash Custom Function to C.Fn-05-2 (p.96). When you press the camera's shutter button halfway, the effective flash range is displayed. Flash exposure compensation (p.22) and FEB (p.23) are available during auto external flash metering. 36