Specifications

Guide
numbers are
given
in
the
chart below
for
popular
films
and
flash lamps.
E
dividing
the
guide
number
by the
number of
feet
between
your
camera
and subjec
you
obtain the conect
aperture setting
(f:stop).
Guide numbers are intended 2
guides
to correct
exposure and
may
be changed
to suit
individual requirement
EXAfrTPLE:
For Ektachrorne Type
F
and
Press
25 flash lamp
at LILO0 shutter
spee
the
chart shows 110
as
the
guide
number. With a
subject
at 10
feet
from
the camer
divide
110
by
10,
which equals 11.
Set
the
aperture
at
f:11.
flash
exposure
guide
FLASHBULB
>
SHUTTER
SPEED
>
*The
five-millisecond delay, characteristic of
gas-filled
lamps,
prevents
adequate
exposure
at shutter speeds faster than
**SF
lamps"require
828
type correction
filter.
***Wire-filled
bulbs require
8lC type correction
filter with this
film.
(For
ELECTRONIC
FLASH UNITS,
use
"X"
setting and consult
manufacturer's exposure
instructions.)
Sylvania
Press 25
(Use
M Setting)
I
/300
75
45**
70
90
110
110
170
55
20
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