Polaroid MP-4 Assembly And Use page 24

5.
Focus:
Adjust
the focusing
knob (E)
until
the image
is
sharp. Normally, at this point,
the
image
wilÌ
not
be
exactly
the
correct
size.
Adjust
the camera
height
again,
as described
in
(4) and refocus. You
may
have
to
repeat
this two or three times,
before
you get
the
image
both exactly the
right
size and also in
focus.
l'inally,
lock the
camera
in position
on
the
column
by turning the
locking lever
in
a
clockwise direction,
without
excessive force.
Center the original on the
baseboard
in
the
way you wish
to reproduce
it.
Remember to
follow
the ground glass marking
which is cor-
rect for the film format
you are using.
Basic focusing
rule: To
increase
the
size of
the
image on
the ground
glass screen,
you
must lower the
camera and increase
the
bel-
lows extension. To
decrease
the
size
of
the
image, you must raise the camera
and
decrease
the
bellows extension.
Normally you should adjust the
camera
height
flrst to get roughÌy the
image
size
you
need, and then
adjust the
bellows
extension
to give you sharp
focus.
However. when you are
working
at or near
the
1:1
reproduction
scale
(that
is, when orig-
inal
and ground glass image are nearly
the
same size)
it
becomes
virtually
impossible to
focus
by
bellows
adjustment.
At
such a set-
ting,
you must reverse the
procedure
described,
and
adjust the
beliows
first
to get
the
approximate image
size
required,
and
then attain
sharp focus by adjusting the
cam-
era
height.
Camera
column scales: There
is
a
millimeter
scale on
the main camera coiumn. When read at
the point indicated,
it
represents the film
plane
to
baseboard distance
for
Polaroid sheet
and
pack fllms.
A
second
miÌiimeter scale, on the
left
focusing column, represents the
bellou's
extension, when
it
is
read at the
point indicated.
These
scales can be useful
if your work requires
you
to frequently reset the
camera
for
one,
or
several,
specific
reproduction ratios. Just
write
down the two respective readings for the
cam-
era settings
involved,
and you
can
eliminate
a
lot
of
repetitive
refocusing.
Note:
If
the
exact
reproduction
scale
must
be
documented, place
a
mier
on
the baseboard and
photograph it with
the original subject.
24
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