Canon EOS 80D - Manual (Page 419)

419
3 Custom Function SettingsN
C.Fn II -6 AF-assist beam firing
Enables or disables the built-in flash’s AF-assist beam or the EOS-
dedicated external Speedlite’s AF-assist beam.
0: Enable
The AF-assist beam will be emitted when necessary.
1: Disable
The AF-assist beam will not be emitted. This prevents the AF-
assist beam from disturbing others.
2: Enable external flash only
If an external Speedlite is attached, it will emit the AF-assist beam
when necessary. 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 the infrared AF-assist
beam will be emitted. Set this when you do not want the camera to
fire the AF-assist beam 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.
C.Fn II -7 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.
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.
 Super telephoto lenses, etc., with a wide focusing drive range can
become grossly out of focus during focus search, taking more time to
achieve focus next time. Setting [1: Stop focus search] is
recommended.
 Even if [0: Continue focus search] is set, focus search may not be
performed when a wide-angle lens is used.