Argus C3 Service Manual

THE
BUILT-IN
SHUTTER
The
escopements
you
hove
studied
so
forore
cleverly
designcd
to
fit
into the
cromped quorters
oround
the
lens. A
complox
problem
in
the
design
of
ony shutter
is
proper use
of
ovoiloblc
spoce.
And in
most
of the
shutters
exomined
in
previous
lessons,
the shutter
mechonism
fits into o
housing
which olso
serves os the
lens mount.
The
ingenuityof
thedesigners
hos
produced escopement geor
troins ond other poris thot ore curved
to
follow the
shope
of
the
housing.
Even
the moin lever
--
in
lorger
models
of
the
Compur,
for
exomple
--
moy be
o ringwhich fits
oround
the
lens
borrel io
toke
best
odvontoge
of
the existing
spoce. Moin
levers
in
mony
other shutters
follow this circulor
pottern,
ond usuolly
provide
for
complete shutter operotion
with o very
minimum omount
of
movement.
So
ihe ports
in
the modulor shutters
you've studied
must be
smqll
in
orderto
fit
the
ovoiloble spoce.
Smoll ports require high
precision
--
ond the
shutter
occurocy
is frequently
the result of
fine
croftsmonship
os
well
os
good design.
NOTE:
Shutters such
os the
Synchro-Compur
00-MXV
ond the
Prontor
SVS
qre
exomples
of
modulor shutters
--
thot
is,
shutters
mode
byo
single
monufociurer
which
moy
be
used
on
comeros
of
mony
different
mokes.
In
controst
to
the modulor shutter,
the
BUILT-lN
SHUTTER
is
integrolwiththecomero itself
--
ond,
os
such, is unique
to
the
porticulor comero in which
it
is
used. Built-in
shutters moy
be
extremely simple
--
such
os
you studied
in
the
Kodok
lnstomotic
ond Brownie Reflex
comeros. Or, they
moy
be
quite
complex
--
suchos
the
focol-plone
shutters
youwill
exomine
in future
lessons.
The
built-in
shutter
tokes odvonioge of the lorge
omount
of
spoce
within the
comero
body.
Since
the
ports
ore not restricted
to the circulor
confines oround
the lens, they con be
mode
com-
porotively lorge, rugged,
ond
simple.
Or, the
ports
moy remoin
smoll
ond
precise
while
the
comero
itself is
scoled down io
pocket-size proporiions.
ln
this lesson, you
will
exomine three
voriotions
of
the
built-in leof-type shuiter. And you'll
see how
the shutfer
blodes
moy
be locoted
either behind the lensor
between
the
lens
elements
--
even though
the
shutter
blode driving ond
timing
mechonisms
ore
spreod
out behind
the
lens
in the
comero
body.
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