THE
FOCUSING
SYSTEM
Tltl.'
I"ad
..
C~nler.!
focusing
system
is
controlled
by
the usc
of
the
two
focus
buttons
shown
in
Fig~
UTe
:-6.
The
Jinkage. consisting
ofltle
focus
bar
assembly.
the
inner frames and
the
U~frdme.
holds
Ih.:
shutler
housing assembly
(containing
the
lenses) in place.
When
the
right focus
button
tS
pushed~
the
focus
bar
assembly
moves
to
the
left
and
pulls the
inner
frame
with
j1.
The
action
of
the
Unkage dr4ws
the
shutter
assembly
toward
the
camera
body,
reducing
the
focal distance (lens-to-film diStance).
When
the
left focus
button
is
pushed,
tile Jinkage
reacts in
the
opposite
manner
and
the
shutter
housing is moved away from
the
camera
body,
increasing
the
focal distance.
The
focusing linkage controlling
lenNe-film
dis-
tance
is
mechanicany
coupled
to
the
particular
type
of
range finder/viewfinder used
on
the
L"'3mera,
A bracket
on
the
focus
bar
is
tied
to
a
pick~up
cam
in the range finder/viewfinder. The
movement
of
the cam adjusts
the
rangefinder/
viewfinder" When
the
image is in
proper
focus
according
to
the
rangefinderjviewfinder (or
when
the
proper
distance is shown in
the
rangefinder),
the
lens is
automatrcally
set
al
the
right foca!
distance.
On
some
cameras,
II
fasf focus
decal
is
mounted
on
the
Jocus
bar
assembly. When
the
focus
but~
Ions <lfC
moved.
the
decaJ slides past an
indicator
on
the
camera
body.
FiduciaJ
marks
on
the
decaJ
are
lined
up
with
the
indicator
to
lJpproximate
distances from the ClJrnera
to
the
subject.
LENSES
There
are
two
types
of
lenses used in
the
pack
camera.
The
following models use a
two
element
(duple!)
molded
plastic lens:
Model 104
Model'25
MOOeI210
Mod,I21S
Model
220
Model
225
Model
315
Model
320
Glass triple
element
(triplet)
lenses are used in
these models:
MooeilOO
Model
230
Model34Q
Model
HH
Model
240
Model
350
Model
102
Model
250
Model
360
ModeJ"I03
Model
330
Mode1135
Mod.lllS
Both
duplet
and
triplet Jenses have similar charac-
reristics,
They
are fjS.S
COloT-<':OrTected
lenses
RFfVF
FAS.T FOCU&
_-IfIf~::-::;;;;;
INOICATOR
FAST
FOCUS
DECAL
FOCUSING COMPON
FOCUS
8AR
FIG.
'2.6
4