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Basic Wireless E-TTI. Autoflash O~eration
(5)
Taking the picture and
flash
confirmation
When you press the shutter but-
ton
con~pletely,
a
wirrlcss signal
is transmitted
to
the slave, then
the slave fires a preflash and then
the main flash when the picture is
taken.
The subject's flash cxposurc reading
is obtained with the
preflash and
used to set the main flash output.
Wireless flash photography is there
-
by executed with an optimum flash
ou1put.
When the correct flash exposure is
obtained, the
ST-E2's flash confir
-
mation lamp lights for about 3 sec.
immediately after the flash fires. If
it does not light, the picture might
be underexposed. In this case, use a
larger aperture or place the slave
28
closer to the subject and repeat
steps
(2) to
(5).
With the EOS
-
3, the model-
Ing flash can be fired to see
B
,'
the lighting effects before
the piclure is taken. See
page 32.
The slave must be properly
positioned to receive the
wireless transmission.
After the picture is taken.
the slave's operation result
is displayed on the slave's
display panel.
If
the slave is in the SE
(Save Energy) mode, press-
ing the
ST-E2's test trans-
mission button will cancel it.
When you press the shutter
button halfway and activate
the camera's exposure
meter, the ST
-
E2 cannot be
used to cancel the slave's
SF:
mode or to execute a test
transmission. The camera's
exposure meter must turn
off (viewfinder's
exposure
setting display turns off)
before the SE mode can be
canceled or a test transmis-
sion executed.
AF
-
assist beam
Under low-light or low-contrast
conditions, the
ST-E2's
AF
-
assist beam
is
emitted to assist
autofocusing.
The
AF
-
assist
beam is compatible with the
EOS-3's Area AF. The AF-assist
beam's effective range
is
about
0.6
meter to
10
meters
at
the
center and
0.6
meter to
5
meters along the periphery.
The ST-E2's AF
-
assist bran>
can
he
emitted only while the ST-E:! is
attached to the EOS-3. In
the
case
of
EOS
cameras with a built
-
in AF
-
assist beam emitter, the beam will
be emitted by the camera.
The slave's AF
-
assist beam is not
emitted (except when the flash is
ready).
44
To prevent overheating, limit
the number of consecutive
wireless transmissions to
50.
After
50
consecutive wireless
transmissions, allow the ST
-
EP
to rest for
10
minutes.
COPY