Nikon SB 20 Instruction Manual page 33

Autofocus speedlight
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To determine light output before selecting aperture
Use the following procedure instead of steps 4 and 5 to determine light output before selecting aperture:
1.
Set the light output
selector so the yellow
light output index indicates
the desired light output.
In
the
example photo, full light out-
put is selected.
2.
Determine and set proper lens aperture_
To
determine correct
aperture,
follow both
the
vertical
line
from the
distance scale window and the dotted
line
from the light output window to
the point of
intersection
.
If the lines do not intersect, move closer to sub-
ject or reset
light
output selector
for
more
light
output.
For example, with the film speed index at ISO 100 and zoom
set
ring at
N,
to shoot a subject 10m away at full light
output,
follow both the
ve
rtical
line
from figure 10 in the distance scale window and
the
dotted
line
from the
light output window to FULL.
The
two
lines
intersect at distance range indi-
cators for f/2.8-you must
set
your lens to
fI2.8.
To take intentionally over- or underexposed pictures
,
open or
stop-down
the lens
aperture.
31

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