Canon EOS 70D Operation Manual - Page 371
C.Fn II -5, AF-assist beam firing, Lens drive when AF impossible, Enable, Disable
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3 Custom Function SettingsN C.Fn II -5 AF-assist beam firing Enables or disables the AF-assist beam emitted by the built-in flash or EOSdedicated external Speedlite. 0: Enable The AF-assist beam will be emitted when necessary. 1: Disable The AF-assist beam is not emitted. This prevents the AF-assist beam from disturbing others. 2: Enable external flash only The AF-assist beam will be emitted when necessary only if an external Speedlite is used. The camera's built-in flash will not fire the AF-assist beam. 3: IR AF assist beam only When an external Speedlite is attached, only with infrared AFassist beam will be emitted. This prevents the AF-assist light from firing as a burst of small flashes. With an EX-series Speedlite equipped with an LED light, the LED light will not automatically turn on for AF-assist. If the external Speedlite's [AF-assist beam firing] Custom Function is set to [Disable], this function's setting will be overridden and the AF-assist beam will not be emitted by the Speedlite. C.Fn II -6 Lens drive when AF impossible If focus cannot be achieved with autofocus, you can have the camera keep searching for the correct focus or have it stop searching. 0: Continue focus search 1: Stop focus search If autofocus starts and the focus is far off or if focus cannot be achieved, the lens drive stops. This prevents the lens from becoming grossly out of focus due to focus searching. Super telephoto lenses can become grossly out of focus during continuous focus search, taking more time to achieve focus the next time. Therefore, setting [1: Stop focus search] is recommended for super telephoto lenses. 371