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CONTROLS
IN
DETAIL-continued
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Example 3:
Shooting a subject
on
land at 8m (26.2ft) without u
si
ng
the wide-flash adapter while using ASAIISO
100
film
and
"MFULL":
The
GN
for "MFULL" at ASAIISO
100
on
land
is
32
(from the chart below). Divide the
GN
of
32
by
the flash-to-subject distance of
8m
to get the
correct aperture,
f/4. Because water absorbs a great
deal of light, however,
you
cannot
use
the same
GN
underwater
as
on
land or your shot will
be
underexposed.
Instead, multiply the on-land
GN
by 1/2 to 1/3 for under-
water photography. (The underwater GNs shown
in
the
following chart are
1/2 of the corresponding
on
-l
and
GNs
.)
Guide
Numbers
in
the
Manual
Mode
•
The
values in parentheses are when the Wide-Flash Adaptor
SW-102
is
being used .
•
The
full amount
of
light
is
emitted when the shooting mode selector
is
at "MFULL" and, even
if
not liynchronized,
at
"AUTO."
TTL
Exposure
Compensation
When
using TTL automatic flash control with the
Nikonos-V camera,
you
can
use
its ASAIISO film speed
dial to make
an
exposure compensation for the shooting
situation or to create intentionally
over- or underexpo
se
d
photos.
The
relationship between the exposure compensation
value and ASAIISO film speed dial setting
is
shown
in
the following chart:
The
useable aperture range for TTL automatic flash
photography changes according to the exposure com-
pensation
value being used. Before using the exposure
calculation dial to determine the useable aperture
range, align the correct shooting situation mark with
new (compensation) setting
on
the ASAIISO film speed
scale.
26
Exposure
Compensation
When
the Nikonos-V
is
used with the
SB-102
in
the TTL
or non-TTL flash mode, exposure compensation
is
re-
quired for
over- or underexposing the picture to match
subject or shooting conditions.
Ea
ch procedure
is
dif-
ferent,
so
read the following instructions carefully be-
fore shooting.
In
addition, if you photograph a subject with very high
reflectivity, such
as
a mirror or metallic surface, under-
exposure
is
almost certain to occur.
To
prevent this,
use
manual flash control.
For example, to make a
+ 2 exposure compen
sa
tion
when using ASAIISO
100
film, reset the ASAIISO film
speed scale to ASAIISO
25,
then read the modified
shooting distance from t
he
dia
l.
· Positive (+) exposure compensation cannot be made at some film
speeds, and negative
(-)
exposure compensation cannot
be
made
at
other film speeds. In these cases, make the necessary compensation
in the non-
TTL
automatic mode (see page 24)
or
use one
of
the manual
I/ashmodes.
•
When
you finish making the exposure compensation,
be
sure to reset
the ASAIISO film speed dial on the Nikonos-V and the ASAIISO film
speed scale
on
the speedlight.