Publicité
43
[3]
Secure
f
ocus.
@] Read t he
ca
mera-to-subj ect distan
ce
off
the
dista nce sca
le.
To obtain the
co
rrect
aperture setting, divide the
guide
number
of the
elect
roni
c
fl
ash unit (or
flashbulb)
in
use
by
the
ca
mera-to-subject
dis-
ta nce.
Th
e
co rrect
apertu re sett
ing
t hus obta ined
must th
en
be
transferred
t
o
the
camera's
aperture
ring
I
n
fl ash
photograp hy,
the
correct
exposu re
is
de-
termined on the basis of the
guide number
of the
electronc
fla
sh
unit
or
fl ashbulb. This
guide
num-
ber is normal ly
indicated
on
th
e
package or
in
the
in stru cti
on ma nual.
To
obtai
n
th
e co
rrect
lens
apertu
re, divide
th
e
guide
number
by
the
sub
ject distance (meters or
f
eet
) as shown below
(distance in meters).
Guide Number (32)
Subject
Oist
ance (2m)
Lens Aperture (16)
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