Part
2:
Technical Information
1.6 E-TTL Flash System
An
E-TIL
Flash
System,
which
operates
when
the
Speedlite
380EX
is
mounted
on
the
EOS
50/55/Elan
II
is
incorporated.
This
E-TIL
Flash
System
is
an
improved
version
of
the
A-TIL
auto
flash
exposure
system.
It
features
flash
output
control
and
automatic
exposure
control
(ambient
light
exposure)
to
balance
the
flash
and
ambient
light
in
day-
light
or
at
night.
The
features
of
this
E-TIL
Flash
System
are
as
follows:
1.
With
the
new
evaluative
flash
metering
system
linked
to
the
focusing
points,
the
camera
sets
the
flash
exposure
automatically
(even
when
the
framing
is
changed)
for
a
variety
of
situations
such
as
back-lit
subjects,
fill-flash,
and
indoor
photography.
*
For
indoor
flash
photography
in
the
Full
Auto
or
Program
mode,
1/60
sec.
is
the
slowest
synchronizing
shutter
speed
that
can
be
set.
Therefore
as
with
the
current
flash
exposure
system,
the
background
behind
the
subject
might
be
underexposed.
2. High
speed
synchronization
( called FP flash)
enables
flash
to
be
used
with
fast
shut-
ter
speeds.
It
allows
you
to
open
up
the
aperture
for fill-in
flash
to
obtain
blurred
backgrounds
for
portraits.
(Creative Zone)
3.
For
flash
photography
indoors
or
under
low-light
conditions,
a slow
shutter
speed
will
be
set
automatically
to
obtain
a
balanced
exposure
between
the
subject
and
background.
(Aperture-priority
AE)
4. With
FE
lock
(Flash
Exposure
lock
).
proper
exposure
even
for
spotlighted
subjects
is
possible.
The
E-TIL
Flash
System
operates
as
follows:
The
Speedlite
380EX
fires a
preflash.
The
camera's
six-zone
flash
metering
sensor
reads
the
ambient
light
immediately
before
the
preflash
is
fired.
It
also
reads
the
light reflected from
the
subject
produced
by
the
pre-
flash.
The
difference
in
the
lighting
of
the
readings
is
used
to
calculate
the
flash
output
which
is
retained
in
memory.
Table
2-8
compares
the
E-TIL
Flash
System
with
existing
flash
control
systems.
Table 2-8 Comparison
of
Flash Control Systems
Item
E-TTL
A-TTL TTL <Built-in Flash)
Near infrared preflash
X 0
X
Tv and Av
Set by brightness infor- Set by brightness infor-
Set according to the
SW-1
ON
mation from the meter- mation from the meter- brightness information
(Shutter
ing sensor. ing sensor and the sub- obtained by the meter-
button
ject distance informa-
ing sensor.
pressed
tion from the near
halfway)
infrared creflash.
Preflash 0 X
X
Flash output
Set and held by the
ambient light and pre-
-
SW-2
ON
flash readings.
(Shutter
Start of front curtain, The main flash is fired
Main flash is fired.
button
X-sync
ON
according to the calcu-
pressed
lated flash output that
completely)
was retained.
TTL-OTF metering
Flash sensor is used.
Flash termination
Flash stonned when flash exoosure
is
orooer.
Fast Shutter Sync. (FP flash)
0
X
X
TTL flash exposure sensor X 0 0
2-17
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