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DETERMINING APERTURE ACCORDING TO THE SHOOTING DISTANCE
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48
The following
graphs
show the
relationship
between
the subject-to-film-plane distance
and aperture
set on
the lens at
ISO
100.
Determine the proper
aperture
from the graph
and set
on the
lens.
For film
speeds
other than
ISO
100,
com-
pensate the
aperture.
With one
step
lower
film
speed,
use one
stop
wider
aperture
(smaller
f-number),
and
vice versa.
Note that
the
graphs
for lenses in normal position only
show
apertures at reproduction
ratios
lower
than
1: 1.
Apertures
are
not given for higher reproduction ratios
with
lenses
in
normal
position.
When using the Micro-Nikkor
55mm
f/
2.8 lens,
for
example,
see
graph
1,
With
ISO
100 film
,
to
shoot
a
subject
Q,5m away from
the
film plane at 1/16 output, set the lens
aperture
to
f/8
.
If your film
is
ISO
25,
set the
lens
aperture to f/4
.
With
a subject closer
than 40mm away from the flash
modules,
attach
the Condenser Adapter
SW-8
and
reset the
lens
aperture
to an aperture
approx.
1/2
stop
smaller.
When the S8-21 is powered by
external
power
source
LA-2
or
LD-2,
use
an aperture
approx.
1/2
stop
smaller
than that determined using the
graph.
"717055mmf
2.
8·55mm
fl
3.
5lEloJ~~fflll;f
For
Micro·Nikkor 55mm
fI2,B
and
55mm
fl3.5
in normal position
:7'~7
1
m
Graph
1
0
.
7
0 .6
t
0
.2
0 .1
(ISO 100)
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1
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PK-
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with
PK
-
13
. /
/
f
/
1.4
2
2.8 4
5.6
8
11
16
22 32
_
II"L.o/;(~')fil
Aperture
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