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The 42DEX'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 1 D5mm 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.
Press the shutter button halfway.
• The autozoom position indicator for
the corresponding lens focal length
lights.
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OFF, rON
am
PILOT
0 0
(--.;;;. • .:..:E-T;..;.;TL~
)
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~ ~ ~ ~ ~
1' : :5
m
. . If a lens focal length shorter.than 24mm is used, the picture's periphery will look
dark.
III ·
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 t05 autozoom position indicator
.lights.
• When the wireless selector is set to
<SLAVE>
(---7page 42), the flash coverage
is set automatically to 24mm.
If where you focus lacks sufficient light or contrast, the 42DEX'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 3D/ELAN 7E and
almost all other EOS cameras. The AF-assist beam is effective from D.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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