Canon Speedlite 155 A User manual
Cation
DLITE
155
A
INSTRUCTIONS
English
EcM
The
Canon
Speedlite
155A
is
an
automatic
electronic
flash
developed
especially
for
AE
flash
photography
with
the
C&non
AE-1.
It
also
makes
AE
flash
photography
possible
with
the
A-l
and
serves
as
an
ordinary
com¬
puter
flash
with
the
Canon
AT-1,
AV-1
and
other
cameras.
When
the
A-l
or
AE-1
is
set
for
automatic
exposure
photography
and
the
pilot
lamp
lights
up,
the
epoch-making
system
of
the
155A
functions
to
automati¬
cally
adjust
the
camera’s
shutter
speed
to
the
X
synchronization
speed
as
well
as
the
aper¬
ture
to
the
prescribed
aperture.
The
ex¬
posure
is
automatically
determined
by
the
amount
of
light
reflected
back
from
the
sub-
ject.This
flash
employs
a
unique
averaged
light
sensing
system
which
reduces
excessive
reflection
from
the
central
area
to
give
better
overall
exposure.
Thus,
the
155A
offers
more
appropriate
exposure
than
do
other
current
flash
units.
An
outstanding
feature
particular
to
the
155A
is
the
automatic
switching
from
the
flash
photography
mode
over
to
the
normal
AE
photography
mode
when
the
flash
is
not
charged
providing
the
AE
exposure
is
within
the
AE
coupling
range.
In
addition,
the
Speedlite
155A
can
be
used
with
the
Power
Winder
A
on
the
AE-1
or
the
A-l
for
sequential
AE
flash
photography.
Synchro
Cord
Socket
Flash
Reflector
Sensor
attery
Chamber
Cover
ASA
Film
Speed
Setting
Dial
Manual
Position
Auto
Position
(Red)
3
Specifications
Type:
Electronic
computer
flash
unit
with
a
series
control
system.
Contact:
Clip-on
type
with
a
directly
coup¬
led
contact.
With
lock
mechanism.
Guide
Number:
17m
or
55ft.
(ASA
100).
The
guide
number
is
obtained
30
seconds
after
the
pilot
lamp
lights
up
when
new
batteries
are
loaded.
Flash
Coverage
Angle:
Adequately
covers
angle
of
view
of
any
lens
with
a
focal
length
of
at
least
35mm
on
a
35
mm
camera.
\
Flashing
Intervals:
(Interval
between
firing
of
flash
and
relighting
of
pilot
lamp
when
using
new
batteries.)
Alkaline-maganese
batteries:
About
7
seconds.
Ni-Cd
batteries:
About
5
seconds.
Number
of
Flashes:
(When
the
flash
is
fired
at
intervals
of
30
seconds
with
new
batteries
loaded).
Alkaline-manganese
batteries:
About
300.
Ni-Cd
batteries:
About
90.
Color
Temperature:
The
equivalent
of
average
daylight.
Correction
made
by
a
Canon-exclusive
green-tinted
diffuser.
Flash
Duration:
1/1000
sec.
to
1/50000
sec.
Flash
Control
System:
By
measuring
the
amount
of
light
reflected
back
from
the
subject.
A
series
control
system
saves
unneeded
energy.
The
flash
offers
an
averaged
light
sensing
distribution.
AUTO/MANU.
Switch:
A
choice
of
three
different
positions:
two
AUTO
posi¬
tions
(red
and
green)
and
a
MANU.
position.
The
red
position
is
f/2.8
at
ASA
100
and
green
position
is
f/5.6
at
ASA
100.
Auto
Working
Range:
0.5
m
to
6
m
with
the
AUTO/MANU.
switch
set
to
the
red
position.
0.5
to
3
m
with
the
AUTO/MANU.
switch
set
to
the
green
position.
ASA
Film
Speed:
ASA
25
to
ASA
800.
Aperture
Scale:
f/1
to
f/32
Distance
Scale:
0.5
m
to
15
m
or
2
feet
to
40
feet
Power
Source:
Use
four
size
A
A
alkaline-
manganese
batteries
(AM-3).
Ni-Cd
batteries
can
also
be
used.
Pilot
Lamp:
When
charged,
the
pilot
lamp
lights
up
automatically
switching
the
camera
over
to
flash
photography
mode.
There
is
no
flash
if
the
pilot
lamp
does
not
light
up.
This
lamp
goes
out
when
the
main
switch
is
turned
off.
The
pilot
lamp
also
works
as
a
flash
testing
button.
Size:
70
mm
x
51
mm
x
105
mm
(2-3/4”
x
2”
x
4-1/8”)
Weight:
300
g
(10-9/16
ozs.),
including
batteries.
Accessories:
Synchronization
Cord
A
(Sold
separately)
and
Case
Subject
to
change
without
notice.
Main
Features
1.
The
aperture
selected
on
the
155A
is
set
on
the
camera
automatically
via
an
electrical
signal
sent
by
the
flash
(in
the
case
of
the
AE-1
and
A-l).
2.
In
the
same
way,
the
light
output
signal
from
the
155A
automatically
sets
the
shutter
speed
of
the
camera
to
1/60
sec.
(X
contact).
3.
Battery
consumption
is
reduced
with
the
employment
of
the
series
control
system.
4.
Average
distribution
metering
is
ob¬
tained
by
suppressing
the
peak
sensitivity
at
the
center
of
the
picture.
5.
When
the
main
switch
of
the
flash
is
at
OFF,
the
camera
returns
to
normal
non-flash
AE
photography
while
the
155
A
is
still
attached
to
the
camera.
6.
Manually
operated
flash
by
cancelling
the
automatic
flash
is
possible.
Summary
for
Use
of
the
155A
See
pp.
8-23
for
detailed
explanation.
1.
Load
the
batteries
correctly.
2.
Attach
the
155A
to
the
camera.
3.
Set
the
ASA
film
speed
on
the
calculator
dial.
4.
Select
the
aperture
with
the
AUTO/
MANU.
switch.
5.
Set
the
155A*s
main
switch
to
ON.
6.
Focus.
7.
Check
the
pilot
lamp.
8.
Check
the
display
information
in
the
finder.
9.
Press
the
shutter
release
button.
Automatic
flash
photography
means
that
the
photocell
of
the
flash
picks
up
the
light
bounced
back
from
the
subject,
its
capaci¬
tor
stores
up
energy
and
stops
discharge
of
6
light
as
soon
as
the
flash
unit
determines
sufficient
light
was
reflected
from
the
sub¬
ject
to
the
unit’s
photocell.
There
are
three
conditions
in
performing
automatic
flash
photography.
1.
Set
the
155A
to
the
film
speed
of
the
film
to
be
used.
2.
Set
the
shutter
speed
to
the
X
synchroniza¬
tion
speed
(when
using
cameras
other
than
the
Canon
A-l,
the
AE-1,
the
AT-1
or
the
AV-1).
3.
Decide
the
aperture
to
be
used
(and,
with
cameras
other
than
the
Canon
A-1
or
AE-1,
set
that
same
aperture
on
the
lens
aperture
ring).
If
the
above
three
conditions
are
fulfilled,
then
all
there
is
left
to
do
is
to
switch
the
flash
on,
focus
and
release
the
shutter.
When
the
Speedlite
155A
is
used
on
the
A-l
or
AE-1
cameras,
there
is
no
need
to
remove
the
aperture
ring
of
the
lens
from
the
‘A’
mark
(automatic
setting).
Synchronization
Cord
A
(optional)
Loading
the
Batteries
Use
four
new
size
AA
alkaline-manganese
batteries
(AM-3
or
RL6)
or
four
new
Ni-Cd
batteries.
Manganese
batteries
can
be
used
but
will
not
last
as
long
as
alkaline-manganese
or
Ni-Cd
batteries.
1.
To
remove
the
battery
chamber
cover,
press
and
slide
it
off
in
the
direction
of
the
arrow.
2.
Load
the
batteries
following
the
diagram
on
the
inside
of
the
battery
chamber.
If
the
battery
poles
are
not
facing
in
the
correct
directions,
the
batteries
may
burst
and
leak,
causing
damage
to
the
flash.
3.
After
having
loaded
the
batteries,
slide
the
battery
chamber
cover
back
on
in
the
direction
opposite
the
arrow
while
holding
down
the
batteries.
Be
careful
to
fit
the
positioning
tabs
on
the
bottom
part
of
the
cover
into
the
grooves.
Since
battery
performance
deteriorates
in
cold
conditions,
keep
the
batteries
warm
until
just
before
use.
Keep
a
set
of
spare
batteries
warm
and
alternate
them
with
the
loaded
batteries
so
that
warm
batteries
are
always
in
use.
Especially
in
temperatures
of
0°C
or
lower,
the
use
of
fully
charged
Ni-Cd
.batteries
is
recom¬
mended.
the
155A
is
not
to
be
used
for
a
long
period
of
tifne.
Follow
the
instructions
of
the
battery
manufacturer
when
recharging
Ni-Cd
bat¬
teries.
*
When
replacing
the
batteries,
replace
all
at
the
same
time
with
four
new
batteries,
all
of
the
same
brand.
*
The
batteries
should
be
unloaded
if
Attaching
to
the
Camera
1.
Turn
the
main
switch
off.
2.
After
loosening
the
tightening
nut
of
the
attachment
leg,
insert
the
attachment
leg
all
the
way
into
the
camera’s
accessory
shoe.
If
it
is
not
pushed
completely
in,
correct
electrical
contact
may
not
be
made.
3.
R
etighten
the
nut
to
lock
the
flash
on.
*
When
attaching
this
flash
to
a
camera
that
does
not
have
a
directly
coupled
contact,
connect
the
optional
Synchronization
Cord
A
first
to
the
155A’s
synchro
cord
socket
and
then
to
the
camera’s
PC
socket.
*
When
not
shooting
with
flash,
make
sure
the
155A’s
main
switch
is
at
OFF.
HOW
TO
USE
WITH
THE
CANON
AE-1
AND
A-1
The
Speedlite
155A
can
be
used
in
three
ways.
I.
AE
flash
photography
with
Canon
FD
lenses.
II.
Automatic
flash
photography
with
Canon
FL
lenses.
III.
Manual
flash
photography.
These
three
usages,
though
somewhat
simi¬
lar,
are
explained
separately
below.
I.
AE
Flash
Photography
with
Canon
FD
Lenses
_
Setting
on
the
Cameras
With
an
A-1
or
AE-1
plus
FD
lens
combina¬
tion,
the
lens’
aperture
ring
should
remain
on
the
“A”
mark
for
AE
flash
photography.
With
the
lighting
up
of
the
pilot
lamp,
the
camera
automatically
switches
over
to
the
flash
circuit.
The
shutter
speed
and
aperture
are
set
automatically
and
proper
exposure
is
obtained
from
the
amount
of
light
reflected
back
from
the
subject.
Preparations
for
AE
Flash
with
the
A-1
or
AE-1
Aperture
Keep
the
aperture
ring
of
the
lens
set
at
the
“A”
mark.
*
In
the
case
of
the
A-1
it
does
not
matter
if
the
AE
mode
selector
is
set
at
Av
or
Tv.
It
also
does
not
matter
where
the
AT
dial
is
set
(except
for
the
“B”
setting).
Shutter
Speed
1.
The
shutter
speed
is
set
at
B
when
B
is
used.
2.
At
all
other
speeds
it
is
automatically
set
at
1/60
sec.
Setting
the
ASA
Film
Speed
Because
the
guide
number
of
the
flash
will
change
depending
on
the
sensitivity
of
the
film
being
used,
be
sure
to
set
the
ASA
film
speed
correctly.
If
you
forget
to
do
this,
you
will
not
be
able
to
get
the
correct
exposure.
1.
Turn
the
ASA
setting
dial
until
the
proper
ASA
value
of
your
film
appears
in
the
ASA
window
and
is
aligned
with
the
white
index
mark.
At
this
time,
the
aperture
will
also
change
accordingly.
Dots
represent
intermediate
film
speeds
*
as
shown
by
the
numbers
in
parentheses.
»
O
.
„J(32X«)
04)00)
(125XI60)
[250)020)
(500)(64O)
A
S
A25
•
•
50
■
*
100
•
•
20b
*
■
400
•
*
800
Also,
check
that
the
ASA
film
speed
is
set
properly
on
the
camera.
AUTO
MANU
AUTO
OFF
O
in
o
^»;
x
&V
▼
-a-
*
\
7
*
8
5,6
4'
i
‘
«
•%o
Sc
&<§>
Switching
the
AUTO/MANU.
Switch
This
switch
is
used
to
set
the
prescribed
apertures
coupled
with
AE
flash
photo¬
graphy.
There
are
two
aperture
settings
for
AE
flash
photography:
the
red
position
and
green
position.
(The
MANU.
position
in
the
center
of
this
switch
should
be
set
when
you
perform
manual
flash
photography.)
Reading
the
Apertures
The
aperture
fixed
by
the
AUTO/MANU.
switch
is
the
value
below
the
aperture
index
mark
of
the
same
color
as
the
switch
position.
For
example,
if
the
AUTO/MANU.
switch
is
set
at
the
red
position,
the
aperture
below
the
red
aperture
index
mark
is
used
for
AE
flash
photography.
The
aperture
will
change
depending
on
the
setting
of
the
ASA
film
speed.
In
the
case
of
ASA
100,
the
red
position
is
f/2.8
while
the
green
position
is
f/5.6.
13
Limits
of
the
Auto
Working
Range
Once
you
have
chosen
an
aperture
by
setting
the
AUTO/MANU.
switch
to
the
red
or
green
position,
there
is
only
a
certain
range
of
shooting
distances
which
will
give
correct
exposure.
The
correct
shooting
distance
range
is
called
the
auto
working
range
and
is
indicated
by
two
lines
below
the
distance
scale.
For
correct
exposure,
use
a
shooting
distance
which
is
within
that
auto
working
range
which
corresponds
to
the
color
of
the
setting
of
the
AUTO/
MANU.
switch.
When
the
AUTO/MANU.
switch
is
set
at
the
green
position
the
auto
working
range
will
read
0.5
m
to
3m
while
at
the
red
position
the
auto
working
range
will
read
0.5
m
to
6
m.
*
Despite
changes
in
the
aperture
due
to
changes
in
the
ASA
film
speed
setting,
the
limits
of
the
auto
working
range
always
remain
fixed.
*
You
may
wish
to
use
the
following
hints
for
choosing
an
appropriate
aperture
in
AE
flash
photography.
Green
Position:
For
deep
depth
of
field.
Red
Position:
For
shallow
depth
of
field
to
make
the
subject
stand
out
from
its
surroundings.
Also
to
be
used
if
the
subject
distance
is
greater
than
3
m.
14
*
When
the
distance
is
less
than
1
m,
the
light
distribution
may
be
uneven
due
to
differences
in
the
optical
axes
between
the
lens
and
the
flash.
Main
Switch
and
Pilot
Lamp
After
completing
the
above
processes,
turn
the
main
switch
on.
The
pilot
lamp
lights
up
when
the
flash
is
charged.
Test
Firing
If
a
flash
is
fired
when
the
flash
testing
button
is
pressed
after
the
pilot
lamp
lights
up,
the
flash
is
operating
correctly.
Focusing
After
confirming
the
limits
of
the
auto
working
range,
look
into
the
viewfinder
and
focus.
If
the
focused
distance
is
outside
the
limits
of
the
auto
working
range,
ex¬
posure
will
not
be
correct.
For
correct
exposure,
change
the
shooting
distance
or
set
the
AUTO/MANU.
switch
to
a
more
appropriate
position.
Checking
the
Exposure
and
Shooting
After
the
pilot
lamp
lights
up,
press
the
shutter
release
button
halfway
and
check
the
viewfinder
information.
Confirm
proper
focusing
and
press
the
shutter
release
button
all
the
way
down
for
shutter
release.
Automatic
Switch
Back
to
Normal
AE
Mode
During
each
flash
interval
between
flash
firing
and
the
time
the
pilot
lamp
relights,
the
camera
automatically
reverts
to
the
non-flash
AE
mode
for
which
it
is
set—
shutter-speed
priority
on
the
AE-1
and
shutter-speed
or
aperture
priority
or
pro¬
grammed
AE
on
the
A-l
depending
on
the
setting
of
the
AE
mode
selector
and
the
AT
dial.
This
is
possible
only
when
the
AE
ex¬
posure
is
within
the
AE
coupling
range.
Once
the
pilot
lamp
relights,
the
camera
will
automatically
switch
back
to
AE
flash
photography.
This
means
that
you
can
shoot
continuously
if
necessary
while
the
camera
alternates
between
the
AE
flash
mode
and
the
normal
AE
mode.
Switching
Off
Set
the
main
switch
at
OFF
after
completion
of
flash
photography
in
order
to
prevent
battery
drain.
The
connecting
circuit
be¬
tween
the
flash
unit
and
camera
is
cut
off
when
the
main
switch
is
set
at
OFF,
and
normal
AE
photography
can
be
performed
with
the
flash
unit
still
attached
to
the
camera.
16
Viewfinder
Information
and
Warnings
Viewfinder
information
is
displayed
as
you
depress
the
shutter
button
halfway
after
the
pilot
lamp
comes
on.
Proper
flash
exposure
is
assured
unless
an
exposure
warning
appears.
1.
A-l
Display
E
0
F
c
.
B
■
Selected
Mode
Shutter
Speed
Flash
Charge
Signal
Flash
Control
Aperture
Manual
Display
AE
Flash
control
60
(bu)
F
2.8
(for
example)
—
Automatic
flash
control
60
(bu)
F
2.8
(for
example)
M
Manual
flash
control
60
(bu)
F
--
M
With
the
exception
of
B,
1/60
will
be
displayed
in
the
viewfinder
irrespective
of
the
shutter
speed
setting
on
the
camera.
A
“bu”
will
be
displayed
if
the
shutter
speed
is
set
to
“B”
on
the
camera.
When
the
pilot
lamp
lights
up,
F
will
be
displayed
to
indicate
charge
comple¬
tion.
The
aperture
selected
in
the
automatic
mode
on
the
155A
will
be
displayed.
2.
Exposure
Warnings
When
the
aperture
selected
on
the
155A
is
larger
than
the
maximum
aperture
of
the
lens,
the
maximum
aperture
of
the
lens
will
be
displayed
and
will
flash
on
and
off
to
warn
of
underexposure.
In
such
a
case,
select
a
smaller
aperture
on
the
155
A.
*
Discrepancy
between
the
Flash-selected
Aperture
and
the
Aperture
Display
in
the
Viewfinder.
Due
to
the
fact
that
the
aperture
displayed
in
the
finder
is
rounded
to
half
f/stops,
it
may
differ
from
the
one
set
on
the
flash
by
half
an
f/stop.
This
will,
however,
have
no
effect
on
exposure
which
will
take
place
at
the
aperture
set
on
the
flash.
There
is
also
a
possibility
that
the
aperture
displayed
in
the
finder
may
flash
on
and
off
if
the
aperture
set
on
the
flash
coincides
with
the
maximum
aperture
of
the
lens.
In
this
case
it
does
not
indicate
underexposure.
Exposure
will
be
correct.
However,
it
is
advisable
to
check
the
aperture
on
the
flash
to
make
sure
it
is
not
larger
than
the
lens’
maximum
aperture.
AE-1
Viewfinder
Information
Once
the
flash
is
charged
and
the
pilot
lamp
glows,
the
meter
needle
will
swing
to
the
aperture
pre-selected
on
the
155A.
If
the
pre-selected
aperture
is
outside
the
aper¬
ture
range
of
the
lens,
either
the
under-ex¬
posure
lamp
blinks
or
the
^
meter
needle
enters
the
overexposure
mark.
In
these
cases,
change
the;
aperture
setting
on
the
155A.
Since
the
meter
needle
does
not
swing
to
the
flash-selected
aperture
until
the
flash
is
charged,
you
could
tell
the
flash
was
ready
for
firing
simply
by
looking
into
the
view¬
finder.
However,
since
it
is
possible
that
the
flash-selected
aperture
might
be
the
same
as
that
chosen
by
the
camera
for
non-flash
AE
photography,
it
is
advisable
to
make
sure
the
pilot
lamp
is
glowing
before
firing.
*
When
you
are
performing
normal
AE
photography
during
the
flash
interval,
there
may
be
a
very
rare
occurrence
where
the
pilot
lamp
will
light
up
while
the
shutter
is
in
operation
if
the
flash
is
charged.
If
this
should
happen,
the
frame
will
be
improperly
exposed.
Precautions
in
Automatic
Flash
Photography
In
some
cases
AE
flash
photography
may
not
be
suited
to
your
subject.
If,
for
instance,
your
main
subject
is
small
while
the
back¬
ground
is
dark
or
distant
or
if
the
background
is
whitish
or
bright
with
strong
reflections,
AE
flash
exposure
may
be
affected
by
the
background,
causing
under-
or
overexposure.
This
can
be
avoided
by
switching
to
manual
flash
control.
If
using
a
self-timer,
do
not
press
the
shutter
release
until
the
pilot
lamp
glows.
When
the
shooting
distance
is
less
than
one
meter,
the
difference
between
the
optical
axes
of
the
lens
and
the
flash
may
result
in
uneven
flash
distribution.
H.
Automatic
Flash
Photography
When
the
AUTO/MANU.
switch
is
on
AUTO,
it
is
necessary
to
set
the
aperture
manually
when
using
an
FL
lens,
(or
when
using
the
flash
on
the
AT-1
or
AV-1).
Setting
the
aperture
manually
can
also
be
done
when
using
an
FD
lens
on
the
A-l
or
AE-1
when
the
aperture
ring
is
disengeged
from
“A”
for
making
exposure
corrections.
The
shutter
speed
will
automatically
be
set
to
1/60
sec.
(unless
set
to
“B”)
on
the
A-l,
AE-1,
AT-1
or
AV-1.
Make
sure
the
ASA
film
speed
is
set
on
the
flash.
I.
using
an
FD
lens,
disengage
the
aperture
ring
from
the
“A"
mark.
2.
P
re-select
an
aperture
on
the
flash
by
setting
the
AUTO/MANU.
switch
to
the
red
or
green
AUTO
position.
Take
into
consideration
the
auto
working
range,
(see
pp.
13-14).
3.
M
a
nually
set
the
flash-selected
aperture,
or
a
different
one
if
correcting
exposure,
on
the
lens
aperture
ring.
Viewfinder
Displays
and
Warnings
The
A-l’s
digital
display
will
include
the
same
information
as
in
AE
Flash
(p.
16)
with
the
addition
of
the
“M”
signal
for
manual
aperture
control.
When
using
an
FD
lens,
exposure
warnings
will
be
the
same
as
those
for
AE
Flash.
If
using
an
FL
lens,
the
lens’
lack
of
a
full
aperture
signal
pin
may
cause
the
aperture
display
and
exposure
warnings
to
be
unreliable.
In
this
case,
it
is
advisable
to
switch
off
the
viewfinder
display
lever.
Viewfinder
information
in
the
AE-1
is
the
same
as
that
for
AE
Flash
(see
p.
18)
with
the
addition
of
the
flashing
“M”
LED
to
indicate
manual
aperture
control.
19
HL
Manual
Flash
Photography
Setting
the
AUTO/MANU.
switch
at
the
back
to
MANU.
places
the
155A
in
the
manual
mode.
When
using
the
A-l,
AE-1*
AT-1
or
AV-1,
the
shutter
speed
is
set
auto¬
matically
as
in
automatic
flash
photography.
The
aperture
must
be
determined
for
each
change
in
shooting
distance
either
by
guide
number
calculation
or
by
using
the
calcu¬
lator
dial
on
the
flash
as
described
in
the
following:
1.
Set
the
AUTO/MANU.
switch
to
MANU.
2.
Be
sure
to
set
the
film
speed
on
the
flash.
3.
Focus
on
the
subject.
4.
Read
the
focused
distance
on
the
lens*
distance
scale.
5.
Look
for
the
same
distance
on
the
155A*s
calculator
dial.
6.
Take
note
of
the
aperture
against
that
distance
on
the
calculator
dial
and
set
the
lens'
aperture
ring
manually
to
that
same
aperture.
If
the
aperture
obtained
seems
to
fall
between
half
click-stops,
move
the
aperture
ring
to
the
click
stop
on
the
brighter
side.
7.
O
nce
the
pilot
lamp
glows,
press
the
shutter
release
button.
If
it
is
necessary
to
fire
the
flash
immediately
after
the
20
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