Nikon SB-102 os Інструкція з експлуатації - Сторінка 22
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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 exposure calculation
dial
with the ASAIISO
film speed in use, find the flash-to-subject distance on
the distance scale,
then
follow the corresponding dis-
tance line up to the aperture scale
.
The
dots
on
the ASAIISO fi lm speed scale indicate the
following intermediate settings:
ASA/
ISO film speed scale
25
50
100
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
situation depends upon the flash-to-subject 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 dial, 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:
When 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
-
sible, 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).