Argus C3 User 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.
2
i

The Argus C-3, Fig . 2, is o good exomple of o 35mm comero
using o built-in behind-the-lensshutter. ln theArgusC-3, olmost
o third of the volume of the comero body is used to house the
shutter mechonism. The result of the Argus design is o shutter
thot is inexpensive to monufocture, eosy to service, ond quite
dependoble -- three foctors which contributed to moking ihe
Argus C-3 one of the most populor 35mm comeros ever designed.
R ELEASE
BUTTON
RANGEF INDER
DISC -
SETT ING
LEVER
FILM WIND
KNOB
FIGURE 2
SPEED KNOB
*
ARGUS C-3
RANGEF INDER
WINDOW
VIEWF INDER
WINDOW
FIGURE 3FRONT PLATE POSITIONS
The Argus C-3 hos two controls in oddition to the setting
ever ond the releose button. One of these controls --the SPEED
KNOB--operotes o com to determine the omount of retord, Fig.3.
3

R ELEASE
BUTTON
COUNTER
DIAL
F ILM
WIND
KNOB
FIGURE 4
The other control permits "bulb" operotion -- iust turn the knurled
releose buiton from "l" (instontoneous)to "B" (bulb), Fig. 4.
Notice thot the speed knob, Fig. 3, contoins the number
colibrotions 4 rhrough 8. The porticulor Argus C-3 illusiroted is
colled the "Motchmoticr" o nome which refers to the unique
method or colibroting the shuiter speeds ond the f/stops. Other
Argus C-3 modeIs ore colibrofed in the conventionol frocfions of
o second. The numberson the Motchmqtic speed knob refer to the
fol lowing shutter speeds:
8 -- l/300 second
7 -- 1/125 second
6 -- l/60 second
5 -- l/30 second
4 -- 1/10 second.
REMOVING THE FRONT PLATE IN THE ARGUS C-3
The front plote ossemblies of the vorious Argus C-3 comeros
vory only slightly. ln the older models, the setting lever is held
by o setscrew. Just loosen the setscrew ond unscrew the setting
lever in o counterclockwise direction.
But the setting lever setscrew is eliminoted in the loter
models -- suchqs the comero illustroted. lnsteod, o JAM NUT --
locoted immedioiely under the setting lever, Fig. 5 -- holds the
setting lever in ploce. The setting lever post (on the moin lever,
os you'llsee in o moment) hos o left-hond threod. So moving
the setting lever counterclockwise to cock the shutter binds the
iom nut ond the setting lever more rightly ogoinst one onother
4
1

,ut"
JAM NUT
*J
FIGURE 5
Hold the newer-style setting lever stof ionory wif h your f ingers
ond turn the iom nut counterclockwise with o thin-heoded wrench
-- you ore now moving the iom nut owoy from the setting lever.
Then, unscrew the setting lever from its post by turning it in o
clockwise direction --ond, ofter removing the setting lever, turn
off the iom nut in the some direction.
CAUTION: Do not remove the Argus C-3 speed knob
during the froni plote d isossembly -- the speed knob remo ins
in ploce on the front plote. ln the Motchmotic, the
speed knob retoining screw is covered by the cemented
colibrotion plote. But in other models, the screw is
visible -- ond there's olwoys o temptotion to remove on
' exposed screw. The speed com -- which controls the
movement of the retord section -- is ottoched to the bock
side of the speed knob. So by removing the screw, you
lose the timing between the speed knob ond ihe speed
com. You con, however, see the properspeed com timing
in f igures 7 ond 8.
Five or six screws (the numberdepending on the model) reioin
the front plote to the comero body. These screws ore underneoth
the leotherette covering the front plote, os indicoted by the orrows
in figure 3. So corefully lift the leotherette ot the four corners
of the front plote with your bench knife -- iry to ovoid teoring
or shorply creosing the leotherette.
,w
';-"-.
5

Another screw is locoted ot the bottom center of the fronl
plote --os indicoted by the doshed orrow in figure 3. And, in
some models, there is o sixth screw odiocenf to the rongefinder
window. You con reoch the lower screw without completely re-
moving the leotherette --either lift the bottomof the leotherette
or cut the leotherette os indicoted by the doshed orrow, Fig. 3.
Moke your cut very corefully with the shorp point of your bench
knife -- when you loter recement the leotherette, the cut will
be olmosf undetectoble.
lf the sixth retoining screw is used, you con cut the leotherette
by the rongefinder window, Fig. 6. Remove oll of the flot-
heoded screwswhich hold the frontplote. Then, corefully lift off
the front plote -- be coreful youdon'tdropouttheCAM
FOLLOWER which remoins wiih the front plote, Fig. 7.
FRONT'
PLATE
SCREW
FIGURE 6
CAUTION: The front
once you've removed
lens to prevent loss or
covity to the right of
lens for theeyepiece moy be loose
the front plote. lf so, lift out the
domoge --the lens sits in the round
the rongefinder ossembly, Fig. 10.
Figure 7 shows the inside of the.front plote--here, you con
see the speed com ond the com follower. The pin on the com
follower fits into the hole in the BELL CRANK (in the lower right-
hond corner of the comero body, Fig. 9). The bell cronk is port
of the linkoge between the speed com ond the speedsescopement,
olso pointed out in figure 9.
6
J

SPEED CAM
CAM
FOLLOWER
PIN ON
CAM
FOLLOWER
FIGURE 7
SHUTTER SET TO l/300 SECOND ("8" ON MATCHMATTC)
i$rylr
FIGURE 8
SHUTTER SET TO l/10 SECOND ("4" ON MATCHMATIC)
You'll notice thot thecomfol lower is otits highest
position when the comero is set to thefostest shutterspeed (l/300
second), Fig.7. And the com fol lower is ot its lowest position
when the shutter is set to the slowest shutterspeed (lrll0second),
Fig. 8.
,$

OPERATION OF THE ARGUS C-3 SHUTTER
The moin lever in the Argus
The SHUTTLECOCK ond o lons
SHUTTLECOCK RIBBON -- con
tension-type mo inspring.
C-3 is o multiple com, Fig. 9.
phosphor bronze ribbon -- the
nect the moin levertothe
MAINSPRING
SHI.JTTLECOCK
SHUTTLECOCK
RIBBON
MAIN LEVER
ESCAPEMENT
BELL CRANK
FIGURE' .
To cock the shutter, rotote the moin lever in o counterclock-
wise direction with your finger -- os shown in figure 10. The
moin lever is then lotched in the cocked position bythe lowerend
of the RELEASE PLUNGER, Fis. I l.
FRONT LENS FOR
EYEPIECE SITS IN
THIS CAVITY
COCKING
ROTATION
FIGURE 1O
Depressing the releose button pushes the reIeose plungerdown
to free the moin lever. Now, the moinspring pulls the shuttlecock
from left to right. cousing the moin lever to rotote ino clockwise
8

BELL
CRANK
SPRING
LOWER
END OF
RELEASE
PLUNGER
RETARD
LEVER
WIRE LINK
FIGURE 11 SHUTTER COCKED
direction. The shuttlecock ossembly, during its releose trovel,
contocts o lug on the blode operoting ring to open the shutier
blodes -- you'll be oble tosee the oction of theshuttlecockmore
cleorly ofter we remove the shutter blode ossembly. A spring on
the blode operoting ring, not yet visible, then closes the shutter
blodes.
Since you've removed the front plote -- ond, olong with it,
the speed comond the com follower--the shutternowdeliversthe
fostest speed (lrl300 second). The reoson is thqt the bell cronk
spring, Fig. ll, holdsthebell cronkoll thewoy inthe
counterclockwise direction .
Setting slower shutter speeds pushes the bell cronk in o
clockwise direction -- the speed com pushes the com follower
down, ond the com follower in turn rototes the bell cronk .
Notice in figure ll thot o long WIRE LINK connects the bell
cronk fo the RETARD LEVER in the speeds escopement.
ln its present position -- V\OO second -- the retord lever
holds the first geor segmenf (in the speeds escopement)owoy from'
the lobeot the bottomof the moin lever. But os youselecf slower
speeds, the bell cronk pulls the retord lever owoy from the
first geor segmenf . The first geor segment then turns clockwise,
under iis own spring tension, os simuloted in figure 12 -- now,
the pin (on the first geor segment) is in the position to intercept
the lobe (on the moin lever) during the releose cycle.
So the posifion of the bell cronk determines the position
of the retord. lever -- ond the retord lever decides how for the
9

LOWER
LOBE
ON
MAIN
LEVER
PIN ON
F IRST GEAR
SEGMENT
FIGURE 12
first geor segment rototes in o clockwise direction. The foriher
the first geor segment moves clockwise, the longer it remoins in
contoct with the moin lever lobe during the releose cycle -- ond
the slower the resulting shutter speed.
The bell cronk pivots onon eccentric beoring which provides
on odiustmentpoint fortheshutter speeds. You'll odiust the shut-
ter speeds ofter replocing the fronf plote -- o hole through the
front plote ollows you to reoch the eccentric beoring, os you'll
see o little loter.
You con see thot the ArgusC-3 retord system is quite unlike
onything exomined in previous sysfems. But the most unusuol port
of the whole design is the time ot which theretord is introduced.
ln othershutters werve discussed, the blodesopen fully before the
speeds escopement slows down the moin lever -- the escopement
then holds the blodes fully open for the required length of time.
Yet in theArgus C-3, the moin leverstrikes thefirst geor segment
iust os the blodesstort toopen. So the retord is introducedduring
the blode-opening time --the slower the shutter speed, the more
slowly the blodes open.
The position of the pin on the firstgeorsegmentot theslowest
shutterspeed is criticol -- coreful observotion now will help you
inodiusting theescopemenf during reossembly. Thot is, thespeeds
escopement hos o sliding odIustment -- ofter loosening the two
screws shown in f igure I3, you con slide the complete escopement
to odiust its position. Referring to figure 13, here's the timing
you should note:
10

With the first geor segment in the slowest-speed position
ond the moin lever in the cocked position, the lobe on
the moin lever should contoct the pin on the first geor ,,
segment -- but, of the some time, comPlete rototion "t '(-
the moin lever must be possible without interference from r
the first geor segment. ,f
a uo-
FIGURE 13
To obtoin "bulb" oction, rotote the releose button until its
"B" colibrotion oligns wiih the index dot on the comero body.
Turning the releose button to "B" rototes the releose plunger to
the poiition shown in figure 14. Now, when you re.leo-se the
shutier, the blqdesopen to the full-open position --butthe flotted
SPEEDS
ESCAPEMENT
SCREWS
PIN ON
F IRSI
GEAR
SEGMENI
END OF
RELEASE
PLUNGER
FrcuRE 14 SHUTTER COCKED, SET TO "BULB"
11

end of the releose plunger cotches the upper lug on the moin lever,
Fig; 15. Consequently, the moin lever is orrested before the
shuttlecock hos moved for enough for the shutter blodes to close.
When you let up on the releose button, the releose pIunger frees
the moin lever--so the mqin levercompletes its rotoiion ond the
shuttlecock moves post the lug on the blode operoting ring.
RELFA 5E
PLUNGER
BLOCKS
MAIN
LEVER
HERE
FIGURE 15 SHUTTER HELD OPEN ON "BULB"
DISASSEMBLY OF THE ARGUS C-3 SHUTTER
SHUTTER
BLADE
ASSEMBLY
RETAINING
SCREWS
FIGURE 16
t2
Remove the shutter blode ossembly by toking out the three
screws shown in figure 16. Now, on ihe bock of the ossembly,
you con see the spring-looded blode operoting ring lug thot is
Lngoged by the shuttleiockossembly to open the blodes, Fig.17 '

BLADE
OPERATING
RING
SPRING
BLADE
OPERATING
RING LUG
FIGURE 17
The shuttlecock is olso cleorly visible ot this time, Fig. 18.
During the cocking cycle, the pivoting oction of the spring-looded
SHUTTLECOCK LATCH, Fig. 18, ollows the lotch to byposs the
blode operoting ring lug --but on fhe releose cycle, the shuttle-
cock lotch engoges the lug ond drives the blodes to the open
position.
SHUTTLECOCK
SHUTTLECOCK
LATCH
FIGURE 18
13

Now, disconnect the wire link from the retord lever. Remove
the two screws shown in figure l9 ond Iift out the entire speeds
escopement.
Disconneci the two tension springs -- the bell cronk spring
ond the moinspring--from the post on the comero body, Fig. 19.
Remove the mqin leverby toking out the screw through its threoded
post, Fig. 19.
SPRING
HOOKING
POST
RELEASE
PLUNGER
PIN SCREW
RANGEFINDER
MAIN LEVER
SCREW
SPEEDS
ESCAPEMENT
RETAINING
SCREWS
RELEASE
PLUNGER
DET E NT
SETSCREW
FIGURE 20
14

To remove the releose plunger, first toke out the setscrew ot
the end ofthe comero body, Fig. 20 --butbe coreful: o spring
ond o boll detent remoin inside the covity. The boll detent octs
on the rototing portof the releose plungerossembly, holding it in
either the "l" or the "B" position; ond the setscrew you iust re-
moved determines f he omount of spring tension on the detent. You
cqn now remove the spring ond the boll deteni from the setscrew
covity.
Remove the bross pin screw ot the front of the comerq, Fig.
I9, ond lift out the releose plunger. The releose plunger is o
complete unit which does not require further disossembly.
As we mentioned eorlier, the bell cronk pivots on on eccentric
beoring. The eccentric beoring is pointed out in figure 21 i the
screwr-olso seen in figure 21, boih holds the odiustment of the
eccentric beoring ond retoins the bell cronk. To toke out the
bell cronk, remove the screw ond the eccentric beoring. Now,
lifi out the bell cronk ond the wire link -- you'll hove to odiust
ihe eccentric beoring on reossembly to time the shutter speeds.
BELL
CRANK
ECCENTRIC
BEARING
BELL CRANK
RETAINING
SCREW
FIGURE 21 . .
You will rorely hove to disossemble the comero ony furth.er
thqn we hove iust done -- ot leost to service the shutter. The
disossembly ond odiustment of the rongefinder, pointed out .in
figure I9,'is covered in o loter lesson -- ovoid disturbing the
rongefinder ot this time.
REASSEMBLY OF THE ARGUS C-3 SHUTTER
Reploce the bell cronk qnd the wire link os one ossembly.
Then, seot the eccentric beoring ond reploce the retoining screw
l5

-- moke sure theeccentricshoulder on the beoring possesihrough
the hole in the bell cronk. While tightening the screw, check
to ossure thot the bell cronk pivots freely.
lnsert the releose plungerossembly through its holeot the top
of the comero -- the elongoted slot in the. releose plunger (which
receives the bross pin screw) must be to the front of the comero.
Then, reploce the bross pin screw from the front of the comero.
The releose plunger should now rotole f reely between the "B"
ond "l" positions -- remember, the boll detent ond spring hold
the releose plunger ot either setting. Ploce first the boll detent,
ond then the spring, into thecovityottheendof thecomero body.
Then, tighten the setscrew unti l you feel the two sol id "cl ick-stop"
positions of the releose plunger.
Before replocing the moin lever ond shuttlecock ossembly,
exomine the ioint between the shuttlecock ribbon ond the moin
lever, Fig. 22. You con seethot theshuttlecockribbon issoldered
within q slot in the body of the moin lever. Replocing o broken
shuttlecock ribbon is one of your more common repoirs in the
Argus C-3.
BODY OF
MAIN LEVER
SHUTTLECOCK
RIBBON
SOLDER JOINT
r:T
-i
FIGURE 22 UNDERSIDE OF MAIN LEVER
Hondle the shuttlecock ribbon very corefully os you lower
the moin lever into position. Accidentolly plocing o kink in the
shuttlecock ribbon could couse the metol to foil during the shutfer
operotion. When the ossembly is fully seoted, reploce fhe moin
lever retoining screw ond hook the end of themoinspring over its
post. Test the movement of the moin lever bycocking ond
releosing the shutter severol times.
Hook the end of the bell cronk spring over the post on the
comero body. Now, cock the shutter ond seot the speedsescope-
16
UNDERSIDE OF MAIN LEVER

ment in oosition. Moke sure thot both the moin lever lobe ond
the retord lever (with its hole end down) ore to the right of the
stud on the firsi geor segment. Then, reploce the two screws
holding the speeds escopement.
Before tightening the two screws, odiust the speeds escoPe-
ment to the position shown in figure 13. Then, tighten the two
screws to hold the odiustment. Check yourodiustment bycocking
ond releosing th-e shutter severol times -- the stud on the first
geor segment must not slip post the moin lever lobe os you cock
the shutter. When you're sure the retord position is correct, hook
the end of the wire link to the hole in the retord lever.
As you seot the shutter blode ossembly, moke sure the stud
on the blode operoting ring is toword the topof the comero. Then,
reploce the three retoining screws -- the Iong screw goes to the
bottom of the shutter blode ossembly.
ADJUSTMENTS ON THE ARGUS C-3 MAIN LEVER
We mentioned eorl ier thot the moin lever is o multiple com.
Actuolly, the moin lever is in three seporote ports -- ond the
relotionships of these ports to one onother moy require odiustment
on reossembly. The two screws provided oi the front of the moin
lever, Fig. 23, hold the sections of the moin lever together os
one piece -- but by loosening the screws, you con reposition eoch
port of the morn lever.
4
xlt -it
t,\ f.\
,,u -f
hp"
!J
SYNC CAM
RELEASE CAM
FIXED SYNC
CONTACT
LUG ON
SYNC CAM
MOVABLE SYNC
CONTACT
MAIN LEVER
ADJUSTMENT
5CREW5

The three sections of the mqin lever ore: the mqin BODY
which secures ihe shuttlecock ribbon, Fig. 22; the RELEASE CAM
which engoges the releose plunger ond the pin on the first geor
segment, Fig.23; ond the SYNC CAM which closes the internol
sync contocts, Fig. 23. To odiust the releose com, you must
loosen both of the screws shown in figure 23. But to odiust fhe
sync com, iust loosen f he one screw indicoted by the doshed orrow.
$
I First, let's check the odiustment of the releose com. Cock
I the shutter ond set the releose plunger to "bulb. " Now, releose
r""J the shufter ond hold the releose button depressed -- the shutter
blodes should remoin fully open. But if the releose com is out of
odiustmenl, the shutter blodes either will foil to remoin open on
"bulb, " or will open only port woy.
Soy, for exqmple, thot the shutter blodes remqin poriiolly
open on "bulb" -- this meons thot the moin lever is blocked by
the releose plunger before rototing forenough toollow full blode
open ing .
The correction is to continue holding the shutter open on
"bulb" ond loosen the two screws, Fig. 23 -- loosening the screws
ollows the body of the mqin lever to turn seporotely from the
releose com. Now, while the releose cqm remoins held by the
releose plunger, ollow the body of ihe moin lever to roiote slowly
(clockwise) until the blodes ore fully open --then, retighten the
screws. As the body of ihe moin lever turns clockwise, the shuttle-
cock ribbon moves forther to the right --ond thoi ollows the'
shuttlecock to open the blodes the odditionol omount.
The other symptom of molodiustment is thot the blodes open
ond close before fhe releose com isqrrested by the releose plunger.
Consequenf ly, ihe shutfer delivers on instonfoneous speed when
sef fo "bulb. " The correction is to loosen the two screws ond turn
the body of the moin lever counterclockwise in relotion to the
releose com.
Once you've odiusted the releose com of "bulbr " you con
check the timing of the sync com. Since only one of the two
screws in figure 23 holds the sync com, od[usting the flosh sync
doesn't disturb the releose com odiustment.
Compored to some of the other shutters you've studied. the
operotion of theArgus C-3 flosh sync is quite simple. Locote the
lug on the sync com in figure 23 -- os.the moin lever revolves in
the releose (clockwise) direction, this lug strikes the movoble
sync conioct. The sync com lug then pushes the'movoble sync
contoct ogoinst the fixed sync contoct to fire the flosh.
18

By loosening the sync com screw, Fig.23, you con move
the synccom tochongethe timeot which the flosh is fired. Here,
yo, houu o wide odiustment ronge -- by iust turning the sync com,
yo, "on chonge the sync deloy oll ihe woy from "F" sync to "X"
sync.
Most Argus C-3ts ore set for "F" sync --thot is, the contocts
close to fire the flosh iust before the shutter blodes stort toopen.
The octuql deloy is then the time it tokes for the blodes to reoch
the ful I -open position. But if your customer wonts you to convert
his Argus C-3 to "X"sync forelectronic flosh, oll you hoveto do
is turn the sync com until the contocts close when the blodes
reoch the full-open position.
REPLACING THE FRONT PLATE AND ADJUSTING
When either the speeds escopement or the bell cronk hos been
removed, you must reodiust the shufter speeds. Strip bock the
leotherette from the Iower right-hond cornerof the front plote to
reveol the inspection disc, Fig. 24. By removing the inspection
disc, you con.reoch the eccentric beoring on the bell cronk.
THE SHUTTER SPEEDS IN THE ARGUS C-3
t'q
Gx;s
\J
FIGURE 24
Set the speed com ot the highest speed (for eose of ol ignment)
ond fit the com follower in position, Fig.7. Now, seot the front
plote on the comero body --you con work through the inspection
hole in the front plote to fit the com follower pin into the bell
cronk hole. Then, reploce the screws holding the front plote --
19

the long screw, if there is one, goesbeside the rongefinder window.
Depress the releose button to moke sure the shutter is in the
releosed position. Now, reploce the setting lever -- remember,
the setscrew-type hos o right-hond threod, while the iom-nui
type hos o left-hond threod. lf you're instolling the seiscrew-
type, turn the setting lever clockwise os fqr os it will go. Then,
bock off the setting lever until it points to l0:30 o'clock, Fig.
25, ond tighten the setscrew.
But if you're insfolling the iom-nut type, first screw on the
iom nut in o counterclockwisedirection os foros it willgo. Then,
turn the setting lever oll the woy down to the iom nut. Bock off
the.setting lever to l0:30 o'cloc!, Ftg. 25. While holding the
setting lever in position, use o thin-heoded wrench to'turn the
ioT nut clockwrse -- until the iom nut is tightogoinst fhe
underside of the setting lever.
FIGURE 25 LEVER
You cqn now moke o foirlyoccuroteodiustmentof the speeds
by iust listening to the retordoction. At the'fostest shutterspeed,
there should be no retord oction -- ond there should be iust o
troce of retord ot the next-to-the-highest speed.
Cock the shutter ond set the speed knob to the fostest speed
(1/300.second). Now, while restrqining the setting lever to'slow
down the moin lever's rototion., push t6e releose b-utton. As you
ollow the moin lever to run slowly through its cycle, listen'for
the sound of the retord
lf you con detect retord engogement al l/3OO second, you
mustodiust the eccentric beoring. vvorking throughthe inspection
20
TIMING OF SETTING

hole in the front plote, loosen the bell cronk screw ond turn the
eccentric beoring. Set the eccentric beoring so you con heor no
retord octionottf,e fostest speed, ond iust o troceof retord ot the
next-to-the-h ighest speed.
But if you con'f get enough odiustment out of the eccenfric
beoring, you moy hove to bend the wire link to chonge its.effective
I ength. Shorten ing the wi re I ink prov ides I ess retord,. ond I engthen -
inglhe wire link provides more retord. Bending the wire link.is
o iough odiustment for the shutter speeds -- you con then moke
fine odiustments by turning the bell cronk lever eccentric.
When you're sure everything is working properly, recement
the leotherette. Pliobond, o rubber-bose cement. works well for
this purpose. Applyo ihin filmof Pliobond to both surfoces--the
comero body ond'the bock of the leotherette -- ond ollow the
cement to dry until it is focky. Be sure your cement is opplied,
evenly -- "lumps" of excessive cemenf con domoge certoin .types
of leotherette. Then, press the leotherette to the comero body.
THE ARGUS C-4 SHUTTER
A more refined comero using the built-in behind-the-lens
shutter is the Argus C'4, Fig. 26. Bui the shutter in the Argus
C-4 beors liftle other resemblonce to the C-3 design you iust
studied.
couNTERBL'fl dffi-,S:
WIND KNOB
RELEASE PLUNGER
RANGEF INDER
DISC
SPEED KNOB
FOCUSING RING
REWIND KNOB
FIGURE 26 ARGUS C-4