Canon Speedlite 430EX III-RT - Manual (Page 22)

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E-TTL II/E-TTL Autoflash by Shooting Mode
EOS DIGITAL cameras have three sizes of image sensors, and the
effective focal length of the attached lens varies depending on the model.
430EX III-RT/430EX III automatically recognizes the image sensor size of
the EOS DIGITAL camera and automatically sets the flash coverage that
is ideal for the effective focal length of the lens in the range of 24-105 mm.
This function optimizes the white balance during flash shooting by
transmitting the color temperature information to the EOS DIGITAL
camera when the flash fires. When you set the camera’s white balance
to <
A > or < Q >, the function is enabled automatically.
Refer to the specifications in your camera’s instruction manual to find
out if it is compatible with this function.
When it is difficult to autofocus on the subject in low-light or when
contrast is low during viewfinder shooting, intermittent flashes (a series
of small flashes) are emitted to help autofocus. The effective range of
the AF-assist beam is approx. 0.7 - 4 m/2.3 - 13.1 ft. at center and
approx. 0.7 - 3.5 m/2.3 - 11.5 ft. at periphery in the viewfinder.
Auto Zoom Adjustment to Image Sensor Size
Color Temperature Information Transmission
AF-Assist Beam
The AF-assist beam, which uses a series of small flashes, is emitted
when 430EX III-RT/430EX III is attached to an EOS DIGITAL camera
with a function for controlling external flashes from the camera’s menu
screen. Note that, depending on the camera model, the camera’s
firmware may need to be updated.
When the color filter is attached (p.37), the AF-assist beam, which uses
a series of small flashes, is not emitted. If AF-assist beam is required, set
P.Fn-05-1 (p.87).
During Live View shooting, the AF-assist beam, which uses a series of
small flashes, is emitted even when the AF method is set to [
Quick AF ].
AF-assist beam firing can be disabled (C.Fn-08/p.84).
Infrared AF-assist beam can be emitted (P.Fn-05/p.87).