AF-Assist Beam
The Speedlite's built-in LED AF-assist beam automatically fires to assist with autofocusing in
low-light scenes.
As for compatible angles of view, the AF-assist beam is effective for lens focal lengths of
24 mm and longer, and the effective range is approx. 0.6–10 m (2.0–32.8 ft.) at the center of
the AF area.
Caution
Focusing with the AF-assist beam of an external Speedlite may be difficult when
using a peripheral AF point on the camera, or when using wide-angle or telephoto
lenses. In this case, use the center AF point or an AF point near the center.
Note
AF-assist beam firing can be disabled in
.
Flash output is fixed for the EOS R3, EOS R7, and EOS R10. For other cameras
with a multi-function shoe, flash output is automatically adjusted to suit brightness.
Depending on ambient brightness, the AF-assist beam automatically switches to
intermittent flash firing for the EOS R3, EOS R7, and EOS R10. For other cameras
with a multi-function shoe, increases of internal temperature automatically reduce
brightness of the LED AF-assist beam or switch to intermittent flash firing, for
safety. Note that this beam may be emitted by the camera instead of by the
Speedlite, depending on ambient brightness.
45
