Canon EOS M Instruction Manual page 132

f: Changing the Autofocus OperationN
Depending on the lens used, the distance to the subject and the
subject's speed, the camera may not be able to achieve correct
focus.
During continuous shooting, the image displayed on the LCD
monitor may seem out of focus.
If you operate the zoom during continuous shooting, the focus may
be lost. Use continuous shooting after using the zoom to obtain the
desired composition.
With Servo AF, the beeper will not sound even when focus is achieved.
AF-Assist Beam
Under low-light conditions, when you press the shutter button halfway, Under low-light conditions, when you press the shutter button halfway, Under low-light conditions, when you press the shutter button halfway,
the self-timer/AF-assist beam may be emitted. It illuminates the subject the self-timer/AF-assist beam may be emitted. It illuminates the subject the self-timer/AF-assist beam may be emitted. It illuminates the subject
to enable easier autofocusing.
When you hold the camera, be sure not to obstruct the self-timer lamp/ When you hold the camera, be sure not to obstruct the self-timer lamp/ When you hold the camera, be sure not to obstruct the self-timer lamp/
AF-assist beam (p.48).
In <5> mode, the self-timer/AF-assist beam does not emit the AF- > mode, the self-timer/AF-assist > mode, the self-timer/AF-assist
assist beam.
The AF-assist beam will not be emitted with Servo AF operation. The AF-assist beam will not be emitted with Servo AF operation. The AF-assist beam will not be emitted with Servo AF operation.
In Creative Zone modes, the AF-assist beam will be emitted when In Creative Zone modes, the AF-assist beam will be emitted when In Creative Zone modes, the AF-assist beam will be emitted when
necessary.
In movie shooting mode, the AF-assist beam is not emitted. In movie shooting mode, the AF-assist beam is not emitted. In movie shooting mode, the AF-assist beam is not emitted.
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],
the LED light will turn on for AF-assist if necessary.
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