Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 375
AF-assist beam firing
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AF-assist beam firing You can enable or disable the AF-assist beam of a Speedlite for EOS cameras. [ ] Enable Enables firing of the AF-assist beam, when needed. [ ] Disable Disables firing of the AF-assist beam. Set if you prefer not to fire the AF-assist beam. [ ] IR AF assist beam only Enables infrared AF-assist beam firing by external Speedlites equipped with this feature, when these flash units are attached. Caution If a Speedlite's [AF-assist beam firing] Custom Function is set to [Disable], the AF-assist beam will not be emitted. 375
AF-assist beam firing
You can enable or disable the AF-assist beam of a Speedlite for EOS cameras.
[
] Enable
Enables firing of the AF-assist beam, when needed.
[
] Disable
Disables firing of the AF-assist beam. Set if you prefer not to fire the AF-assist beam.
[
] IR AF assist beam only
Enables infrared AF-assist beam firing by external Speedlites equipped with this feature,
when these flash units are attached.
Caution
If a Speedlite's [
AF-assist beam firing
] Custom Function is set to [
Disable
], the
AF-assist beam will not be emitted.
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