Canon Speedlite 430EX III-RT Instruction Manual - Page 22
Auto Zoom Adjustment to Image Sensor Size, Color Temperature Information Transmission, AF-Assist Beam - flash compatible cameras
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E-TTL II/E-TTL Autoflash by Shooting Mode Auto Zoom Adjustment to Image Sensor Size 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. Color Temperature Information Transmission 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 or , 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. AF-Assist Beam 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. 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). 22