Polaroid MP-4 Assembly And Use page 25

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6.
Prepare camera
for
taking
picture:
If
you
are
using
the sliding
camera head,
depress
the
button (F)
and, while holding
it
in,
slide
the head
to the
left
as
far
as
it will
go.
For
details
on
how to insert
a
film
holder,
see
the next
page.
7.
Set shutter speed
and lens aperture for
correct exposure:
First,
determine
the
cor-
rect
exposure
for the
conditions
in which you
will
be
working. Among the factors
to
be con-
sidered are
film
speed,
nature of the subject
being photographed and reproduction ratio.
An
exposure
guide for
the MP-4 camera
and
Polaroid Land films is available; contact the
nearest
Polaroid
office (see
page
37).
To set
the shutter
speed,
turn the
silver
ring
to place the indicator
(G)
at the
desired
speed.
It
will
click
into position. Never
set
the indicator between shutter
speeds.
To set the lens
aperture, turn the lens
ring
to place
the
desired
aperture opposite the
dot
(H).
The
ring
will
click
into position.
The lens
may aÌso be set between
full
aperture
settings.
I
Guide to exposure control
Exposure is the amount of
light that
reaches
the
film
through the lens.
It
is
controlled by
the length of
time the shutter is
open (shut-
ter
speed) and
the
size of
the
opening
in
the
lens
(lens
aperture).
The
shutter
stays open
for the length
of
time indicated on the
ring.
The
numbers
sig-
nify
fractions of a
second;
thus, 60
:
1/60
sec.,
4
:
%
sec.,
I :
1
sec.,
etc.
The lens
opening can be made
larger
or
smaller. The
size
of the
opening
is measured
in
f-numbers, u,hich are rnarked on
the
lens
ring.
The
highest f-number indicates the
srnallest opening;
the lou'est f-number
indicates
the largest
opening.
Each lens opening
will
admit either
twice
as
much
or half
as
much
light
as
the
one
next
to
it
on
the
ring.
Thus,
changing
from
f/11
to
f/8
will
double
the
exposure; changing from
flll
to
f
116
will
cut the
exposure
in half.
To
increase exposure (make
pictures
lighter),
use
a longer
exposure
time (slolr,'er
shutter
speed),
or
a
larger
Ìens opening (aperture).
To decrease exposure (make pictures
darker),
use a
shorter
exposure
time
(faster
shutter
speed),
or a
smaller lens
opening
(aperture).
Shutter
speeds
r25
60 30 15 8 4 2
r
Da
rke n/L
i
ghte
n
-----------È
Lens
openings
4.5 5.6 8 ii 16 22
32
Li
ghten/Da rken
--------------)
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