Canon EOS50D EOS 50D Instruction Manual - Page 179
C.Fn III -3, AF point selection method, C.Fn III -4, Superimposed display, C.Fn III -5, AF-assist
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3 Custom Function SettingsN C.Fn III -3 AF point selection method 0: Normal Press the button and use to select the AF point. 1: Multi-controller direct Without pressing the button first, you can just use to select the desired AF point. Pressing the button will set it to automatic AF point selection. 2: Quick Control Dial direct Without pressing the button first, you can just use the to select the desired AF point. By holding down the button and turning the dial, you can set the exposure compensation. C.Fn III -4 Superimposed display 0: On 1: Off When focus is achieved, the AF point will not flash in red in the viewfinder. Recommended when it is bothersome to see it light up. The AF point will still light when you select it. C.Fn III -5 AF-assist beam firing The AF-assist beam can be emitted by the camera's built-in flash or by the external, EOS-dedicated Speedlite. 0: Enable 1: Disable The AF-assist beam is not emitted. 2: Only external flash emits If an external, EOS-dedicated Speedlite is attached, it will emit the AFassist beam when necessary. The camera's built-in flash will not fire the AF-assist beam. If the external, EOS-dedicated Speedlite's [AF-assist beam firing] Custom Function is set to [Disabled], the Speedlite will not emit the AF-assist beam even if the camera's C.Fn III -5-0/2 is set. 179