Flash Range
'SO
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To determine
the appropriate
flash range from
the
graph above, find the selected lens aperture
on the ver-
tical
line for
the film
speed (ISO) being used. Imagine
a horizontal
line
drawn
across
the
graph
from
this
point,
The minimum
subject
distance
is indicated
by
the point
where
the horizontal
line crosses the mini,
mum distance line for the appropriate
lens focal length.
The
maximum
subject
distance
is indicated
by
the
point
where
the horizontal
line crosses the line for the
appropriate
lens focal
length
and
flash
power
level.
CDNormal power level
@
"Lo"
power level
@
Minimum distance
@
Lens aperture
®
Subject distance (m)
Flash
range is from
the minimum
subject
distance
to
the maximum
subject distance.
For
example,
the blue
lines on the graph
above,
show
the
flash
range,
when
using
ISO
100
film,
a
50mm
lens, and an aperture
of
f/2
with
the flash at
normal
power
level.
In
these
conditions,
the
flash
range is from
0.5m to 14m.
•
The
minimum
possible
aperture
when
the camera
is set to P exposure
mode is f/2.8.
