Canon Speedlite 430EX III-RT - Manual (Page 32)

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Flash coverage (the range covered by the flash light) can be set
automatically or manually. With the <
L > (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 <
d > (manual) setting, you can manually set flash
coverage in the range of 24 to 105 mm.
1
Press the < H > button.
Press the < H > button of the
< S > cross keys.
2
Set the flash coverage.
When you want to set the flash
coverage automatically, set <
X >.
When you want to set the flash
coverage manually, select a number
(indicating the focal length in mm).
Turn < 9 > to select the flash
coverage, then press < 8 >.
e : Setting the Flash Coverage
N
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
<
O > warning is displayed on the LCD panel. When using a camera
with the image sensor size smaller than full-frame, the < O >
warning is displayed when the actual shooting angle of view is wider than
the angle of view of a 24mm lens.