Canon Speedlite 430EX III-RT Instruction Manual - Page 32
Setting the Flash Coverage, Press the <, > button.
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e: Setting the Flash CoverageN Flash coverage (the range covered by the flash light) can be set automatically or manually. With the (automatic) setting, the flash coverage is adjusted automatically according to the focal length (shooting angle of view) of the lens in use and the image sensor size (p.22). With the (manual) setting, you can manually set flash coverage in the range of 24 to 105 mm. 1 Press the button. Press the button of the cross keys. 2 Set the flash coverage. When you want to set the flash coverage automatically, set . When you want to set the flash coverage manually, select a number (indicating the focal length in mm). Turn to select the flash coverage, then press . When you set the flash coverage manually, set the same or a wider coverage than the angle of view for shooting to avoid darkening the periphery of the picture. When a lens with a focal length less than 24 mm is attached, the warning is displayed on the LCD panel. When using a camera with the image sensor size smaller than full-frame, the warning is displayed when the actual shooting angle of view is wider than the angle of view of a 24mm lens. 32