VOIGTLANDER Vito C - Page 13

The
lens
operlure
required
for
correct
exposure
con be obtoined
from
so-
colled
guide
numbers,
usuolly
quoied
on
the
flosh bulb
pocking
or
in the
leoflets
issued
with
the bulb
or
elec-
tronic
flosh
unit.
To
find
the
correct
operture
divide
the oppropriote
guide
number
by
the
distonce
in feet
between
the
subiect
ond
f
losh
gun
on
the
co merq.
Aperlure
=
guide
number
*
dislsnce
Exqmple:
guide
number
75
=
5
Distqnce
15
feet
So
set
the operture
holf-woy
between
f/4
ond
f/5.6.
Flosh bulbs
Shutter
speed
Philips
PF
I
PF5
PF 14
PF 25
Osrom
XM
I
XM5
I
/30
second
M2
M5
No.
0
No.
5
No.
25
Electronic
flosh
Shutter speed
lnstonto
neous
releose
1/ao
to
1/2so
second
-9-
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