Specifications
Basic
Wireless
E-TTL
Autoflash
Operation
(5)
Taking
the
picture and
flash
confirmation
When
you press
the
shutter
but-
ton
completely,
a
wireless
signal
is transmitted
to the
slave,
then
the
slave
fires
a
preflash and
then
the
main
flash
when
the
Picture
is
taken.
o
The subject's
flash
exposure
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
output.
r
When
the
correct
flash
exPosure
is
obtained,
the
ST-E2's
flash
confir-
mation
lamp
lights
for about
3
sec.
immediately
after
the
flash
frres.
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-
LJI
ing
flash
can
be
fired
to see
the
lighting
effects
before
the
picture 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.
r
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
SE
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.
OAF-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.
o
The ST-E2's
AF-assist
beam
can
be
emitted
only
while
the
ST-E2
is
attached
to
the
EOS-S.
In the
case
of
EOS
cameras
with
a built-in
AF-
assist
beam
emitter,
the
beam
will
be
emitted
by the
camera.
r
The
slave's
AF-assist
beam
is
not
emitted
(except
when
the
flash
is
readv).
To
prevent
overheating,
limit
the number
of
consecutive
wireless
transmissions
to
50.
After
50 consecutive
wireless
transmissions,
allow
the
ST-E2
12
r;
o
@
PILOT
to
rest
for
1o minut"r.""
"'
--
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