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.
2
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