Canon Speedlite EL-5 Advanced User's Manual

AF-Assist BeamThe Speedlite's built-in LED AF-assist beam automatically fires to assist with autofocusing inlow-light scenes.As for compatible angles of view, the AF-assist beam is effective for lens focal lengths of24 mm and longer, and the effective range is approx. 0.6–10 m (2.0–32.8 ft.) at the center ofthe AF area.CautionFocusing with the AF-assist beam of an external Speedlite may be difficult whenusing a peripheral AF point on the camera, or when using wide-angle or telephotolenses. In this case, use the center AF point or an AF point near the center.NoteAF-assist beam firing can be disabled in C.Fn-08.Flash output is fixed for the EOS R3, EOS R7, and EOS R10. For other cameraswith a multi-function shoe, flash output is automatically adjusted to suit brightness.Depending on ambient brightness, the AF-assist beam automatically switches tointermittent flash firing for the EOS R3, EOS R7, and EOS R10. For other cameraswith a multi-function shoe, increases of internal temperature automatically reducebrightness of the LED AF-assist beam or switch to intermittent flash firing, forsafety. Note that this beam may be emitted by the camera instead of by theSpeedlite, depending on ambient brightness.45