Nikon os Speedlight SB-102 - Manual (Page 25)

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Manual Flash Control
Manual flash operation allows you to control the light
output of the SB-102 by setting the shooting mode
selector to one of three positions: “MFULL,” “M1/4,”
or “M1/16.”
To determine which setting to use, begin by aligning the
correct shooting situation mark with the correct speed
on the ASA/ISO fiim speed scale. Next, locate the
flash-to-subject distance on the distance scale and
follow the corresponding distance line up as it crosses
the aperture scale. At each intersection between the
distance line and an f/stop iine on the aperture scale,
one of four conditions will be present: 1) the distance
line will intersect the extreme right-hand edge of the
f/stop line (the “MFULL” mark), 2) the distance iine will
intersect a semicircle (the “M1/4" mark), 3) the dis­
tance line wiil intersect a triangle (the "M1/16” mark),
or 4) the distance line will intersect an unmarked portion
of the f/stop line. The first three conditions indicate the
manuai flash mode that can be used at those particular
f/stops.
Before shooting, set the shooting mode selector to
correct position and set the correct aperture on the lens.
Example 1:
When shooting a subject underwater at 1 m (3.3ft) with­
out using the wide-flash adapter while using ASA/ISO
100 film, you can select one of three aperture/mode
settings: f/16 at “MFULL,” f/8 at “M1/4,” or f/4 at
“M1/16.”
If the shooting distance changes to 5m (16.4ft) but you
still want to use “MFULL,” you should use an inter­
mediate aperture setting between f/2.8 and f/4.
To determine the correct f/stop without using the expo­
sure calculation dial, divide the GN (from the chart on
page 26) by the flash-to-subject distance (in meters).
Example 2:
When shooting a subject underwater at 4 m (13.1ft)
without using the wide-flash adapter while using
ASA/ISO 100 film and “MFULL,” divide the GN (16) by
the shooting distance [4m (13ft)] to get the correct
aperture (f/4).
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