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CONTROLS
IN
DETAIL-continued
___
_
Exposure
Calculation
Dial
®
In
flash photography, which apertures can
be
used
is
closely related to the flash-to-subject distance.
To
deter-
mine the useable apertures, align the shooting situation
mark on the
exp
osure c
al
culation d
ia
l with the ASAIISO
film speed
in
use,
find the flash-to-subject distance
on
the distance scal
e,
then follow the correspond
ing
d
is-
tance line
up
to the aperture scale.
T
he
dots
on
the ASAIISO
fi
lm sp
eed
scale indicate the
following
in
termediate settings:
ASA/ISO film speed scale
25
50
1
00
200
.)
00
800
1600
• • • • • • • • • • • • • • • • • • •
32
40
64
80
125 +
160
250
+
320
500 j 1000 j
640 1250
•
The
exposure calculation dial can
be
removed to clean sand
or
other
foreign matter from behind
it.
TTL
Automatic
Flash
Control
In
TTL automatic flash photography, the useable aper-
tures are from
f/2.8 to f/22 (when using ASAIISO
100
film), although the actual range for a specific shooting
situat
ion
depe
nd
s upon the fl
as
h
-t
o
-su
bject distance.
The
actual ranges for specific situations can
be
easily
determined with the exposure calculation dial.
22
Removing the Exposure Calculation Dial:
Remove the exposure calculation dial screw @ by turn-
ing
it counterclockwise with a coin, then
pu
ll
up
on
the
dial.
To re-attach the di
al,
correctly align its center notches
with the mounting notches
on
the back of the flash
head
and
push down
on
the dial. Insert the exposure
calculation dial screw
and
turn
it
clockwise
as
far
as
it
will
go.
Example 1:
W
hen
the shooting situation mark
..
is
opposite the
100
on
the ASA/ISO film speed scale and
you
want to
shoot at
f/5.6,
you
can take pictures of subjects located
between 1 m (3.3 tt) and 5.6 m (18.4
ft).
When
the shooting situation mark
~
is
opposite the
400
on
the ASAIISO film speed scale and you want
to
use
f/5.6,
you
can shoot subjects located between
O.7m
(2
3tt) and
4m
(13.1
tt).
Before
you
select
an
aperture to
use,
always take the
flash-to-subject distance into consideration.
To
increase
the flash-to-subject coupling distance
as
much
as
pos-
sib
l
e,
select a larger flstop
(a
numerically smaller
f-number).
In
the opposite case, close-up shooting,
select a smaller f/stop
(a
numerically larger f-number).