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AF: Changing the Autofocus Operationt
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Under low-light conditions, when you press
the shutter button halfway, the AF-assist
lamp may be illuminated. It illuminates the
subject to enable easier autofocusing.
AF-Assist Beam
When an EF or EF-S lens is used, the focus will be locked as shooting starts,
even if you shoot continuously with Servo AF (except for STM lenses).
When using Servo AF in a Creative Zone mode, the beeper will not sound even
when focus is achieved.
When you hold the camera, be sure not to obstruct the AF-assist lamp (p.48).
In <5> or <C> mode, the AF-assist lamp does not emit the AF-assist beam.
The AF-assist beam will not be emitted when [AF operation] is set to [Servo
AF].
In Creative Zone modes, the AF-assist beam will be emitted when necessary.
In movie shooting modes, the AF-assist beam will not be emitted.
Emission of the AF-assist beam makes it easier to focus at the center of the
screen.
Depending on the lens attached, the AF-assist beam may be obstructed and
the camera may not be able to focus automatically.
You can enable or disable the AF-assist beam with the [4: AF-assist beam
(LED) firing] setting under [54: Custom Functions (C.Fn)].
When using an external flash, the AF-assist beam of the flash will not be
emitted. However, if you use an EX-series Speedlite (sold separately)
equipped with an LED light, when [AF operation] is set to [One-Shot AF], the
LED light will turn on for AF-assist if necessary.