Nikon Nikonos Speedlight SB-103 Kullanım Kılavuzu - Sayfa 19
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Man
Manual flash operation allows you to control the light
output of the SB-103 by setting the shooting mode
selector/power switch to one of three positions
:
"MFULL,"
"M1/4
,"
or "M1/16
."
To determine which setting to use, select an aperture
from the exposure calculation chart and set it on the
lens.
At each intersection of a distance line
®
and an
aperture line on the aperture scale
@,
one of four condi-
tions will be present: 1) the distance line will intersect
the extreme right-hand edge of the aperture line (the
"MFULL" mark),
2) the distance line will intersect a
semicircle (the
"
M1/4
" mark),
3) the distance line will
intersect a triangle (the
"M1/16"
mark), or 4) the dis
-
tance line will intersect an unmarked portion of the f/stop
line.
The first three conditions indicate the manual flash
mode that can be used at those particular f/stops.
Example 2:
If the shooting distance changed to 3 m (9 .B ft) but you
.
still wanted to use
"MFULL,"
you would have to use an
intermediate aperture setting between f/S .6 and fiB
.
To determine the correct f/stop without using the expo-
sure calculation
chart,
divide the GN from the chart
by the flash-to-subject distance (in
meters).
Example 3:
.
When shooting on land at Sm (16.4ft) without using the
wide-flash adapter while using ASA/ISO 100 film and
"MFULL":
The GN for "MFULL" at ASA/ISO 100 on
land is 20 from the chart. Divide the GN of 20 by the
flash-to-subject distance of Sm to get the correct aper-
ture,
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-
When shooting underwater at 1.2 m (4.3ft) without using
the wide-flash adapter while using ASA/ISO 400 film,
you can select one of three aperture/mode settings
:
f/16 at
" MFULL,"
fiB at
"M1/4,"
or f/4 at
"
M1/16
."
water
photography.
(The underwater GNs shown are
1/2 of the corresponding on-land GNs.)
Guide Numbers in the Manual Mode
•
The values in parentheses are when the Wide·Flash Adapter
SW-I03 is being
used.
•
The full
amount
of light is
emitted
when the
shooting
mode
selector
is at
"
MFULL."
19