Polaroid MP-4 Assembly And Use page 7

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The MP-4 shutter
The
MP-l
s]'stem
uses
a self-cocking, lens-
less
shutter. The
lenses
for the MP-4
do
not
have
built-in shutters;
each
lens can
be
attached
to the
one
universal
shutter, which
is
mounted
in
a ìens
board,
for
easy camera
attachment.
The
shutter
speeds
range
from
1
sec. to
1/125
sec., and
there
is a
"8" setting for time
exposures. There is
also
a flash socket with
"X"
synchronization. Lens aperture settings
are
incorporated
into
each lens.
The
shutter
accessories
are described
on
page
33.
Lenses
for the MP-4
A.
135mm
lens; f/4.5
to
f/32
B.
105mm lens;
f14.5
to fl32
C.
75mm
lens:
f14.5
to
fl32
D.
50mm
lens;
f14.5
to
fl32
E.
35mm
lens;
f14.5
to fl32
F.
17mm
lens; fl4 to fl22
The focusing screens
Three ground
glass
focusing
screens are
avail-
able
for the
MP-4.
AII
are
for
use
with Polaroid
Land
film
holders described on
the next page.
They
also can
be
used
with most wet-process
4
x
5 sheet
film
holders, and some
wet-process
roll film holders.
They
are
scribed for
Polaroid
4
x
5
sheet
film
and 3%
x 4/a pack
fiImformats.
(The
4
x
5
pack
film
image area extends
from the right-hand
marking
to
about
%
in.
(3 mm) beyond
the
left-
hand
marking.)
Ground glass 44-50:
This is a
standard ground
glass
screen,
for general-purpose
photography.
Aerial
image
ground glass
44-51: This is
a
ground
glass
with
a clear-glass
circle
in
the
center. The image can be focused on
the ground
glass in the normal way,
or
it
can
be focused
in
the clear spot
as an
"aerial image."
Aerial
image
focusing
is particularly
useful
in
photomicrog-
raphy and
in
some
areas
of low light-level
photography, such as high-magnification
photomacrography.
Calibrated
ground glass
44-54:
It
is
caìibrated
in
inches
and centimeters,
to measure reproduc-
tion
size.
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