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

i

Argus C3 - Page 11

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