Operation Manual

ffi{-JIDE
VALUE
The
guide
value
indicates how
the flash
power
should be
adjusted to obtain correct exposure
at the
i
ndicated
aperture-sh utter
combination.
1. Guide
value
{GV}
control
with shutter-priority
measu
reme
n
t
Changing
a
GV readout
after
measurement
auto-
matically changes
the aperture
readout to
reflect
this
change:
lf
GV is changed from
0
to
+1,
the
aperture
required
changes
f
rom
f/5.6
to
f
18.
2.
Guide
value
(GV)
control with aperture-priority
measurement
When electronic
flash
is
measured, the
GV indi-
cates
whether
flash
power
is correct at
the
aperture
and
shutter speed
displayed.
To
get
correct exposure
at
f/5.6
and
1/60
sec.,
flash
power
should be increased one
stop
(doubled)
or
the
flash-to-subject
distance
should be decreased
by
a
factor
of 111.4.
To
get
correct exposure
at
f/5.6
and
1/60 sec.,
f
lash
should
be
decreased
two
stops
(one-quarter
power)
or
the
flash-to-subject
distance
should
be
doubled.
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TIME
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Relation between
GV,
flash
power,
and
flash-to-subject
distance.
GV
-8 -7
-6 -5
-4 -J
-2 -1
o
+1 +2
+{
+4 +5
+6 +7 +8
F lash
power
11256x
1
I
128x 1164x
'l
l32x
1116x 1l8x
1l4x
1l2x 1x 2x
4x
8x
16x
32x
64x
128x
256x
FIash-to-sub-
iect
distance
16x 11.3x
8x 5.7x
4x
2.8x
2x 1.4x 1x 1 l1 .4x
1l2x
"l12.8x
1l4x 1
15.7
x
1l8x
't
11
1 .3x 1116x