Canon Speedlite 420EX Instruction Manual - Page 21

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Flash in Other Picture-Taking Modes Av : E-TTL Autoflash and Aperture-Priority AE When you want to control the depth of field or when you want both the subject and background exposed correctly, use aperture-priority AE. You set the aperture, and the camera sets the shutter speed automatically to expose the background correctly. The E-TTL autoflash exposure is based on the aperture you set. 41 Set the camera's Command Dial to (aperture-priority AE). • Set the high-speed sync switch to Ay' < • >. Set the desired aperture. • Turn the camera's electronic dial to set the aperture. Ea B.u^-2'1.1,1,2•• Take the picture. Focus the subject, check that the icon is lit in the viewfinder, then take the picture. In low-light conditions, a slow sync speed is set automatically. A tripod is recommended for slow sync speeds. If the camera's fastest sync speed blinks, the background will be overexposed. If the 30" sync speed blinks, the background will be underexposed. Change the aperture setting until the sync speed stops blinking. 21

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Flash
in
Other
Picture
-Taking
Modes
Av
:
E-TTL
Autoflash
and
Aperture
-Priority
AE
When
you
want
to
control
the
depth
of
field
or
when
you
want
both
the
subject
and
background
exposed
correctly,
use
aperture
-priority
AE.
You
set
the
aperture,
and
the
camera
sets
the
shutter
speed
automatically
to
expose
the
background
correctly.
The
E-TTL
autoflash
exposure
is
based
on
the
aperture
you
set.
Ay'
Ea
B.u^-2'1.1,1,2••
41
Set
the
camera's
Command
Dial
to
<Av
>
(aperture
-priority
AE).
•
Set
the
high-speed
sync
switch
to
<
•
>.
Set
the
desired
aperture.
•
Turn
the
camera's
electronic
dial
to
set
the
aperture.
Take
the
picture.
Focus
the
subject,
check
that
the
<i>
icon
is
lit
in
the
viewfinder,
then
take
the
picture.
In
low
-light
conditions,
a
slow
sync
speed
is
set
automatically.
A
tripod
is
recommended
for
slow
sync
speeds.
If
the
camera's
fastest
sync
speed
blinks,
the background
will
be
overexposed.
If
the
30"
sync
speed
blinks,
the
background
will
be
underexposed.
Change
the
aperture
setting
until
the
sync
speed
stops
blinking.
21