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66
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Focus and t
hen
read off the
camera-t o-subject di
s-
tance on the dista nce sca le of the lens. T he
correct
f-
number
in correspondence
w
ith t he subject d istance may
be
computed by
div id ing the f lash unit's gu ide number
by t he subject d istance. For example, at a distance of
5
met
ers w
it
h a
gu
ide
nu mber
of 20 (ASA 100
in
meters),
t he
correct
f-
nu
mber is
f /4
:
G N
207
5 (d
istance in met
ers)
=
f/4
•
When
t he guide number is given in feet
,
see that the
flash-t
o-sub ject
distance
is
converted
to feet.
•
T he Co ntax
RT
F 540 f
lash unit
w
it
h
a bu
il
t-in electro-
manget
ic shutter re lease
ca
n
also be emp loyed
with
t he
FR
I.
For operatin
g details,
refer
to t he
RTF 540
in
struct io
n
ma nua
l.
•
When employ ing flash bu lbs, use the synchron
ization
speeds given in the fol lowing tab
le.
Shutter Speed
1/15
1/8
1/4
1/2
1
Flash bulb
0
0
0
0
0
(FP,M MF)
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