Flash coverage, Af-assist beam, Oi' o – Canon 420EX User Manual

Page 16: Criri: 1, Press the shutter button halfway, Af-assist beam preconditions

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Flash Coverage

The 420EX's flash head zooms automatically to provide adequate flash

coverage for the lens focal length in use. Flash coverage is provided for the

24mm to 105mm focal lengths The corresponding autozoom position
indicator on the Speedlite lights.

When a zoom lens is used, the flash coverage changes automatically to

suit the focal length you zoom to.

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Press the shutter button halfway.

‘ The autozoom position indicator for

the corresponding lens focal length

lights.

If a lens focal length shorter than 24mm is used, the picture's periphery will look

dark.

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When the flash coverage changes, the Speedlite's Guide No. also changes.
See the Guide No. table on page 50 to see how the Guide No. changes.

If the lens focal length is 105mm or longer, the 105 autozoom position indicator

lights.

When the wireless selector is set to <5LAVE> (^page 42), the flash coverage

is set automatically to 24mm.

AF-Assist Beam

If where you focus lacks sufficient light or contrast, the 420EX's AF-assist

beam is emitted automatically so that the camera can autofocus. The AF-

assist beam can cover the focusing points of the EOS 30/ELAN 7E and

almost all other EOS cameras. The AF-assist beam is effective from 0.7 to
7 m/2.3 to 23ft. at the center focusing point.

AF-Assist Beam Preconditions

The preconditions for the AF-assist beam to be emitted are explained on

page 51.

16

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