This camera manual library is for reference and historical

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Congratulat ions on your choice of the Zenza Bronica GS-l, a lens shutter types ing le lens re f lex camera in the 6x7 format .

The GS-1 provides the professional user with a l ightweight and compact 6x7format single lens ref lex of extremely useful versati l i ty and mult i- functionalperformance, which is based on the history and experience gained in the devel-opment of the Zenza Bronica ETRS and SO-A single lens ref lexes, as well as thelatest technological advances in the electronic f ield.The GS-1 has been developed as a ful l-scale system camera, with a wide range ofversati le accessories and especial ly with complete f i lm back interchangeabil i tywhich g ives i t mul t i - format capabi l i ty for use in a wide f ie ld o f app l icat ions,including commercial photography, news photography, scienti f ic photography,etc . , as wel l as g iv ing th is 6x7 format s ing le lens re f lex versat i l i ty equal to the35mm s ing le lens re f lex camera.

Although instruct ions fol lowing are based on the GS-1 camera main body, theZenzanon-Pc 100mm lens and the Fi lm Back GS 120, the choice of f inder is leftto the discret ion of the photographer who should also read the instruct ions forthe f inder chosen. The choice of lens, f i lm back and f inder should be based onthe type of assignment contemplated by the user.To obtain best results from theZenza Bronica GS-1, may we suggest that youread this instruct ion manual through careful ly, before you even touch the cam-era, as your p leasure in us ing the camera wi l l be even greater i f you thoroughlyfami l ia r ize yourse l f w i th i ts work ing par ts before load ing your f i rs t ro l l o f f i lm.


corvtenrrsSpecif ications of the Zenza Bronica GS-1 2Parts of the Zenza Bronica GS-l 4

1. Loadingthe Battery 72. Main Switch 83. ,Finder Display and Battery Checking . . . . 84. At tachment and Removal of Fi lm Backs . . I5 . Const ruc t ionof F i lm Back . . . . . . .116 . F i l m L o a d i n g . . . . . . . . 1 17 . F i lm Speed D ia l . . 158 . E x p o s u r e C o m p e n s a t i o n D i a l . . . . . 1 59. Fi lm Type Indicator Frame . . 16

1 0 . E x p o s u r e C o u n t e r . . . . . 1 611. F i lm Wind ing /Shut te r Cock ing . . . .171 2 . F i l m U n l o a d i n g . . 1 713. Sett ing the Shutter Speed Dial . . . . 181 4 . S h u t t e r R e l e a s e B u t t o n . . . . . 2 01 5 . T i m e ( T ) E x p o s u r e . . . . 2 11 6 . E x c h a n g i n g L e n s e s . . . . 2 21 7 . I n t e r c h a n g i n g F i n d e r s . . . . . . 2 3

18. Set t ing the Aper tu re R ing . . .231 9 . F o c u s i n g A d j u s t m e n t s . . . . . . 2 420. Distance Scale and Depth of Field Scale . .252 1 . I n f r a r e d P h o t o g r a p h y . . . . . . 2 52 2 . F l a s h P h o t o g r a p h y . . . . 2 62 3 . M u l t i p l e E x p o s u r e s . . . . 2 724. Mirror Lock-Up . .2825. Remote Control Operations . . . . . .3026. Interchanging FocusingScreens . . . .3027. Removal and Attachment of the Fi lm

W i n d i n g C r a n k A s s e m b l y . . . . 3 228. Attachment of the Neck Strap . . . . 332 9 . F a c t s a b o u t t h e B a t t e r y . . . . . 3 430. Pointers on Shooting . . . 3531. Care of the Zenza Bronica GS-l . . . .3532. Depth of Field Tables . .3733. Specifications of Zenzanon-PG Lenses . . . 38

e


Specification$'of the Zenza ihicarcs-t i iiiiirrri;:.:..t

Type 6 x 7cm format lens shut ter s ingle lens ref lex camera, wi th interchangeable lens, f i lm back,finder and focusing screen systems.

Frame size 55.6 x 69.0mm (4:5 rat io matching the s ize of the photographic paper) .

Fi fm 120 ro l l f i lm;22O rol l f i lm; 135 ro l l f i lm in f i lm cart r idges; and Polaroid Land Pack f i lms(wi th exclusive f i lm backs required for each f i lm type).

Standard lens Zenzanon-PG 100mm F3.5; interchangeable type; s ix e lements in four groups; mul t i - layerant i - ref lect ion coated; 48o angle of v iew; F22 minimum aperture; and minimum 0.75mfocusing distance.

Fi l ter s ize 72mm diameter on 100mm F3.5 standard lens.

Lens mount Bronica GS mount (exclusive four-c law bayonet) .Focusing adjustment Hel ical focusing system bui l t in to each lens.

Lens diaphragm Fully automatic instant reopening lens diaphragm; 1 12 stop increments; equal-distant aper-tu re scale graduations.

Shutter Electronic control SEIKO #0 between-lens leaf shutter; shutter speeds from 16 sec. to

1 /500 sec. , wi thout intermediate set t ings, p lus T ( t ime exposure), B (bulb) and A (automat ic

exposu re) .Shutter release Electro-magnetic shutter release system; also has electro-magnetic cable release system.Fi lm winding Fi lm winding crank, wi th one fu l l forward revolut ion or ratcheted winding act ion.Mul t ip le exposure Mul t ip le exposure possib le wi th mul t ip le exposure lever on camera body.Mirror lock-up Cont inuous mirror lock-up possib le wi th mirror lock-up lever on camera body.F i lm back

Finder

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Dayf ight loading interchangeable type; exclusive f i lm backs tor 12O and 22O rol l f i lms (6x7,

6x6 and 6x4.5 formats) , 135 ro l l f i lm (24x36and 24x69 formats) and Polaroid Land Packf i lm; wi th ASA/ISO f i lm speed dia l and exposure compensat ion dia l (coupl ing to f inderswi th bui l t - in exposure meter) . ]f nterchangeable type; shows 94o/o of the actual f ield of view (which does not change uponexchanging f inders) . I

II

*..'- *-.;{.^


,t::.

Focusing screen Interchangeable type; standard type, supplied with camera, has full-area matte screen.Finder indicat ions Shutter speed, etc. , is shown at the top of the f inder area, outs idethe screen area;5 dig i ts ,

7 segments and dot indicat ion, depending on f inder at tached.Flash synchronizat ion X€ett ing ( for a l l speeds up to 1/500 sec.) ; automat ic f lash contro l , wi th d i rect exposure

meter ing of f i lm surface is possib le (wi th exclusive dedicated electronic f lash uni t ) .Bat tery checking Steady i l luminat ion or f l icker ing of shut ter speed display in f inder, wi th hal f -st roke of the

shutter release button.

Battery Single 6 volt silver oxide or alkaline-manganese battery.D imens ions 106 .5 (w ide ) x 99 (h igh ) x 80 ( long) mm - GS- l ma in body on ly .

106 .5 (w ide ) x 1 16 (h igh ) x 196 .5 ( l ong ) mm - GS- l , w i th s tandard 100mm lens , F i lm BackGS 120 and Wa is t - l eve l F inder G .

Weight 630 grams (GS-l main body only, wi thout bat tery) .

1830 grams (GS-l , wi th standard 100mm lens, Fi lm Back GS 12Oand Waist- level Finder Gbut without battery).

The above specif ications are subject to changes without prior notice when necessary for thepurpose of improving performance.

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Focus ing r ing

Flash synch socket

AE f inder contacts

Shut ter speed d ia lShutter speed scale

window

Screen removal leve( tef t )

Mirror lock-up lever

Aperture r ing

Depth of f ield scale

Distance scales

Lens a l ignment dot

LED d isp lay p la te

F i l m w i n d i n g c r a n kassembly release lever

Screen removal lever( r isht )

ASA/ISO f i lm speedcontacts

Manua l f i lm w inder

Spool holder

Shutter release button


:

Pinder release button

Back cover release button (topl

Main swi tch

Shut ter speed d ia l lock but ton

F i l m w i n d i n g c r a n k Depth of f ield preview lever

Lens release button

Neck strap eyelet

Mul t ip le exposure lever

Neck strap eyelet

Back cover release button (bottom)

E lectro-magnetic cablerelease socketFi lm back re lease

buttonDark s l i de s l i tF i lm p lane mark


Fi lm winding crank assemb

Time exposurelever release

Accessory contacts

F i l m w i n d i n gcoupler

Exposure compensation dial lock button

Time exposure lever

Tripod socket

Battery chambercover

Battery chamberbutton

ASA/ lSO f i lmspeed scaleASA/ lSO f i lmspeed d ia l lockbutton

Exposure compensat ion d ia l

Exposure counAccessory guide sockets window

Fi lm type ind icator f rame


A. Depress the battery chamberbut ton wi th your f inger and, atthe same time, move the batterychamber cover in the arrow- in-dicated di rect ion. The cover wi l lcome of f qui te easi ly .

B. Coincide the plus (+) andminus (- ) marks on the bat teryw i th s im i la r po la r i t y i nd i ca t ionsin the bat tery chamber. Then,push in the bat tery.lnsert the battery chamber coverinto the BATTERY end f i rs tand then move the cover in theother d i rect ion unt i l i t locks.

* The shut ter wi l l not operatewhen the bat tery is loaded wi thpolar i ty marks reversed.

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2 I Main Switch

The main swi tch is located onthe upper lef t s ide of the mainbody . There wi l l be no opera-t ions un less the main swi tchis pushed down ( i .e. , swi tchedo N ) .* There is no power consump-t ion , even w i th the main swi tchON" However, the bat tery- l i few i l l be shor tened when the shut -ter release is stroked halfwaysand the shut ter speed disPlaYl igh ts up s tead i l y o r f l i ckers .There fore , sw i tch OFF (pushup) the main swi tch when i t i snot p lanned to use the camerafor some t imes.

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A. An LED display located overthe top center of the focusingscreen shows the shut ter speed,etc. , wh ich is v iewed lateral lyreversed with the waist- levelf inder .S ince the LED d isp lay d i f fe rswi th the f inder in use, p leaseread the instruct ions suppl iedwith the f inder for correct usageand read ing .

B. Turn ON the main swi tchand then stroke the shut ter re-lease but ton hal fways. l f theLED d isp lay in the f inder l igh tsup steadi ly or f l ickers, as thecase may be, the battery isloaded proper ly and there issuf f ic ient power for operat ions.

{ t l f the LED d isp lay does no tl ight up steadi ly or does notf l icker, as the case may be,(1) the bat tery is not loadedproper ly or Ql the bat tery iscomple te ly d ra ined and shou ldbe exchanged.

3 I Finder Display and Battery Checki


4 Attachment and Removal of Film Backs

The f i lm back is a f i lm cham-ber that can be attached or de-tached f reely f rom the mainbody, thus permitt ing f ree ex-change of f i l rn types, at a l lt imes. Since the main body andf i lm back are always fu l ly cou-pled, upon connection, alwaysturn the f i lm winding crankcompletely one t ime, upon at-taching the f i lm back. l f wind-ing is not possible, al l prepara-t ions for taking the picture havebeen completed. l f winding ispossible, however, rotating thef i lm w ind ing c rank un t i l i t s topsautomatically takes care of theincompleted act ion, whether un-cocked shutter or f i lm not ad-vanced. Th is means, of course,that i t 's possible to choose thefi lm type most suited for theshot, even midway in a ro l l .

An ASA/ISO f i lm speed dia land an exposure compensationdial are avai lable on the f i lmbacks. When used for sett ing thef i lm speed of the f i lm loadedin the f i lm back, there is auto-mat ic coupl ing when f inders

with built- in exposure metersare attached on the main body.This wil l , of course, be very con-venient when using f i lms of d i f -ferent sensi t iv i t ies in the f i lmbacks.

iF Make fu l l use of f i lm back in-terchangeabil i ty, in the f ol low-tng manner:-1. Take ful l advantage of themult i-format superiority of theGS-l and use f i lm backs inmany different formats, wh ichwi l l not only g ive you di f ferenteffects but wil l economize onf i lm .2. Take \/our pictures in colorand black-and-white, and in dif-ferent f i lm speeds, as required.3. Keep a suf f ic ient guant i ty ofpreloaded f i lm backs on handand speedy, continuous shoot-ing wi l l be possib le.4. Don' t waste unsui table f i lmused in a previous session buts imply load up a new f i lm backwith the required f i lm type.5. The Polaroid Fi lm Back canbe used for instant color orblack-and-white pictures, when

in a rush, or used for checkingcomposit ion or l ighting effect,before taking the actual picture.

{F Film backs are avaifable op-tionally and the type meetingthe requirernents of the photog-rapher should be chosen.


A. To at tach the f i lm back tothe main body, s imply insert thelatches at the upper end of thef i lm back into at tachment open-ings at the upper end of themain body. Then, press thelower end o f the f i lm backagainst the main body unt i l i tlocks securely.

* The dark s l ide must be wi th-drawn from i ts s l i t , upon at tach-ment of the f i lm back to themain body, as otherwise theshutter cannot be re leased.

B. The dark s l ide must be in-serted into the dark s l ide s l i t ,for removing the f i lm back f romthe main body. Insert , wi th the@ mark at the top, as i l lustrat-ed , and then push in a l l t he way .

* There is danger of the f i lmback becoming detached fromthe main body, i f the dark s l ideis lef t in i ts s l i t whi le the camerais being carr ied. Therefore, makei t a ru le to wi thdraw the darksl ide whenever the f i lm back isattached to the main body.

C. Depress the f i lm back re leasebutton and the lower end of thefilm back can be removed, asi l lustrated. Simply shi f t the f i lmback up s l i gh t l y and pu l l i taway.

* The dark s l ide cannot bewithdrawn from the f i lm back,when the f i lm back is detachedfrom the main body.

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F i l m h o l d e r

A. The f i lm back consists of af i lm ho lde r and f i lm back f rame,wi th exclusive f i lm backs avai l -ab le fo r 120 and 220 ro l l f i lms .The f i lm ho lde r i s no t on ly de -tachable f rom the f i lm back buta l so has a bu i l t - i n f i lm w ind ingmechanism.

* Read instruct ions suppl iedw i th the F i lm Back GS 135 fo rload ing 135 ro l l f i lm .

B. The f i lm back f rame has abase wi th a dark s l ide s l i t and aback cover wi th an ASA/ISOf i lm speed dia l , an exposurecompensat ion dia l and a f i lmtype indicator f rame. The f i lmback f rame completely enclosesthe f i lm ho lde r and sh ie lds i tf rom outs ide l ight , as wel l asconnect ing i t to the main bodyand also coupl ing wi th f inderswi th bui l t - in exposure meters.

A. To open the back cover,squeeze the top and bot tomback cover release buttons, inthe arrow- indicated di rect ions,at the same t ime and the backcover w i l l open .

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B. l t wi l l be possib le to takeou t the f i lm ho lde r , uPon open-ing the back cover.

C. The f i lm holder has twospool holders, wi th the r ight onefor the f resh f i lm spool whi lethe lef t one is for the emptytake-up spool . The top spoolholder is opened, as i l lustrated,by s l i d ing the f i lm (spoo l ) i nthe arrow- indicated A di rect ion.The new f i lm spool should becoincided on the r ight-s ide bot-tom shaf t , which is f ixed, af terwhich the top spool holdershould be c losed to engage thespool .

* The spool holders on the topwi l l be locked securely, whenthe back cover is c losed.

Black sur face o f leader mustface ou t

I\ ,E m p t y t a k e - u p s p o o l

F r e s h f i l m s p o o l

D. Af ter loading the f resh f i lmspool proper ly, draw out thelead ing end o f the f i lm and tu rni t across the f i lm pressure Plate(as i l lustrated). Run i t acrossand turn i t over to the take-upspool . Insert the leading endinto the s l i t of the take-up spooland wind s l ight ly unt i l securelyengaged.

* The inside black surface ofthe leader must face out whenru nn ing across the pressu replate, in th is case.

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E. Ro ta te the manua l f i lmw inder on top o f the f i lm ho lde rin the arrow- indicated di rect ionand w ind up the f i lm leader .When the star t ing point , or ar-row mark, appears, a l ign i t wi ththe t r iangular V star t -mark onthe r ight top s ide of the f i lmholder. Then, stop rotat ion.

F. The star t ing point can alsobe al igned wi th the star t -mark,wi th the f i lm holder loaded inthe f i lm back . In th i s case ,s imp ly ro ta te the f i lm w ind ingcrank of the main body to a l ignthe star t -mark. This method ispreferable s ince there wi l l becoupl ing wi th the camera bodymechan ism, f rom the beg inn ing .

* l f the f i lm is not advancedwhen the f i lm w ind ing c rankis rotated, however, the f i lmholder is not loaded proper ly inthe f i lm back and/or the cameramain body may be set for mul t i -p le exposures. In the lat ter case,return the mul t ip le exposurelever to an upr ight or vert icalpos i t i on .(See "Mu l t i p le Exposures " onpage 27.l

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G. Close the back cover, bypressing i t f i rmly against ther ight s ide of the f i lm back base,as i l lustrated. The back coverw i l l au tomat i ca l l y l ock andclose.The same operat ion wi l l c losethe back cover when the f i lmback is detached f rom the mainbody.

H . Upon load ing the f i lm , ro -ta te the f i lm w ind ing c rank un t i li t s tops to p lace the f i rs t f rameinto place for taking the picture.The exposure counter wi l l a lsochange f rom "S" to "1 " , w i ththe f i lm advanced and the shut-ter cocked.

l . The manua l f i lm w inder i sused to place the f irst f ramein to pos i t i on , when the f i lmback is detached f rom the mainbody.The manua l f i lm w inder w i l l no tstop rotat ing, even when thef i lm is in p lace for the f i rs tf rame, but should be rotated2 or 3 t imes more, in order totake up s lack in the loaded f i lm .

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1 2 0 r o l l f i l m

IS t a r t i n g m a r k

22O rol l f i lm

ID o t t e d l i n e S t a r t i n g m a r k

* When load ing 220 ro l l f i lmin the F i lm Back GS 220 , donot mistake the dot ted l ine be-fore the arrow mark for thestart-mark.

* For the use of f i lm backsother than the 6x7 format, readthe instruct ions suppl ied wi ththe f i lm back .

Set the f i lm sensi t iv i ty of thef i lm loaded in the f i lm back,when us ing f i nde rs w i th a bu i l t -in exposure meter. To set thef i lm speed, depress the ASA/ lSOf i lm speed d ia l l ock bu t ton and ,at the same t ime, rotate theASA/ISO f i lm spped dia l and setthe required f i lm speed to theindex. The dia l has c l ick-stopsa t 1 /3 rd i nc rements .

Exposure compensat ion up to+3 stops is possib le at 1/3rd in-crements. To set the requiredcompensat ion, s l ide the expo-sure compensat ion dia l lockbut ton, in the arrow- indicateddirect ion, then rotate the ex-posure compensat ion dia l , asrequ i red.When compensat ion is notneeded, s imply set to "O",where i t is locked.* There wi l l be no ef fect on theexposure, no matter where theASA/ISO f i lm speed dia l and ex-posure compensat ion dia l areset , when a f inder wi th a bui l t - inexposure meter is not used.

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Upon load ing the f i lm , tea r o f fthe end f lap f rom the emptyf i lm package and inse r t i t i n thef i lm t ype ind ica to r f rame. Th isw i l l he lp you keep t rack o f thef i lm loaded in the f i lm back ,even when two or more f i lmbacks are used wi th d i f ferenttypes of f i lms.

O ran ge

C9

O r a n g e W h i t e O r a n g e


The f i l r n w ind ing c rank au to -mat ical ly stops, when rotatedcompletely one t ime in the for-ward d i rec t i on , w i th f i lm ad -vanced one f rame and shut tercocked, at the same t ime.Or, short , rapid strokes, up toan accumulated fu l l rotat ion,wi l l a lso do the same job be-cause of a ratcheted mechanism.

* The mirror lock-up lever mustbe vert ical at a l l t imes, exceptwhen shoot ing wi th the mirrorlocked up.(See "Mirror Lock-Up" on page28.1

A. Af ter the 10th exposure ofthe 120 ro l l f i lm (20 th exposureof the 22O rol l f i lm), cont inuerotat ing the f i lm winding crankand the f i lm on ly w i l l be ad -vanced un t i l t he rema in ing f i lmand leader paper are wound upon the take-up spool .Open the back cover when thereis no resistance in the windingact ion.

B . Remove the f i lm ho lde r and ,whi le prevent ing the loose f i lmf rom unw ind ing , take ou t thetake-up spool . Seal the exposedf i lm and re tu rn i t t o i t s o r ig ina lbox unt i l development.

* Load and unload f i lm awayf rom direct sunl ight and/ors t rong i l l um ina t ion .

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A. The shut ter speed scale isv iewed in i ts window over theshutter speed dia l . The numberson the scale are shut ter speedsett ings, wi th numbers 1 to 165fu l l numbers and numbers 2 to500 f ract ions of a second. Forexamp le , "165" i s 16 seconds ,"2" is ' l l2 sec. and "500" is1 /500 sec.A is the set t ing for aperture-pr ior i ty AE (automat ic expo-su re ) when a f i nde r w i th a bu i l t -in exposure meter is at tached.B (bulb) is the set t ing used tokeep the shut ter opened, as longas the shut ter but ton is de-pressed. However, since power

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B The numbers on the scaleare color-coded in red andwhi te. Red-colored numbers areful l number set t ings of 1 secondand longer whi le whi te-colorednumbers are set t ings f rom 112to 1/500 second, as wel l as thef etters " A" and "8" ,The shutter speed can be setbefore or af ter f i lm winding.(For "Time (T) Exposure", seep a g e 2 1 . )

is consumed dur ing th is t ime,the use of T ( t ime) exposureis recommended for exPosureslonger than one m inu te .

A

500

250

125

60

30

t 5

8

4

2

I

2 S

4 S

8 S

t 6 s

B

W h i t e

- W h i t e


C. The shut te r speed d ia l i s se tto A , fo r aper tu re-pr io r i t y AEphotography when a f inder w i tha bu i l t - in exposure meter i sat tached. To set A, press theshut te r speed d ia l lock bu t tonand rotate the shut ter speedd ia l , a t the same t ime. Tochange f rom A to another set-t ing , fo r manua l photography ,press the lock but ton and rotatethe shut te r speed d ia l to the re -qu i red se t t ing . However , theshutter speed dia l cannot bemoved d i rec t l y f rom A to B , inth is case, o r f rom B to A , too .

I t The shut ter speed, when theshutter speed dia l is set to A, is16 seconds, when a f inder w i tha bu i l t - in meter i s no t a t tached.

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An electro-magnet ic shut ter re-lease but ton is incorporated inthe Zenza Bron ica GS- l . S t rok-ing the re lease but ton hal fwayi l luminates the shut te r speed, asd ig i ts and do ts , e tc . , in the d is -play panel in the top center ofthe f inder , ou ts ide the screenarea.The d isp lay w i l l go ou t whenthe re lease but ton is st roked al lthe way and a shut ter re leasewarn i ng LED w i l l l i gh t up mo-mentar i l y , when the exposureis completed and the shut terb lades are c losed, wh ich shou ldbe checked when us ing a s lowshut te r speed.

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In the fo l low ing cases , the shut -ter wi l l not be re leased and theshut te r re lease warn ing LED wi l ll i gh t up , except in the f i rs t in -s tance: -1 . Ma in sw i t ch i s OFF .2 . Dark s l ide is inser ted .3 . F i lm is no t advanced. (Samewhen exposure counter is be-twggn "S " and "1 " . 14 . Shut te r i s no t cocked.5. Lens is not at tached Proper-ly . (Same wi th au tomat ic ex ten-s ion tubes , too . )

6. Lens re lease but t in is de-pressed.7 . A l l f rames ( i .e . , 10 f ramesfor 120 ro l l f i lm and 20 fo r 22Oro l l f i lm) have been exposed.

' r r There wi l l be u nderexposurei f t he f i lm w ind ing c rank i s ac -c idental ly rotated before con-c lus ion o f the exposure , on aslow shut ter speed set t ing. Fur-thermore , the shut te r w i l l no tbe re leased on the fo l lowingsho t un t i l t he r ema in i ng t imef or the previous exposu re hase lapsed.


A. First , cock the shut ter wi ththe f i lm w ind ing c rank and thenpu l l up the t ime exposure leve rre lease.

B . S l i de the t ime exposure leve rand re lease the shut ter , when ared-colored "T" is exposed onthe lens ba r re l . The shu t te r w i l ls tay open unt i l the t ime expo-sure lever is moved in the op-pos i te d i rec t i on , expos ing thele t te r "A" , wh ich w i l l c lose thesh ut ter .

* Except for t ime exposures,always shi f t the t ime exposurelever so that the let ter "A" isv is ib le on the lens barrel andkeep the t ime exposure leverrelease pushed in a l l the way.

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l5 l Exchanging Lenses

A. To at tach the lens, a l ign thewhi te dot on the main body andthe red dot on the lens, andthen inse r t t he lens f u l l y i n to i t smount. Rotate counter-c lock-wise ( in the arrow- indicateddirect ion) unt i l i t s tops, wi than aud ib le c l i ck , wh ich w i l l i n -d icate that i t is securely locked.

B. To detach the lens, press thelens re lease but ton down and,at the same t ime, rotate the lensclockwise (as arrow indicated)unt i l i t makes a fu l l s top, atwhich point i t wi l l be possib leto detach the lens.

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A. Var ious types of opt ionalf inders can be interchanged tomatch shoot ing condi t ions tophotographic condi t ions. To at-tach the f i nde r , a l i gn the f ron tend of the f inder wi th the f rontend of the f inder f rame on topof the main body, as shown.Then , gen t l y l ower the f i nde rand, when wel l seated, s l ideforward unt i l i t locks.

B. To detach the f inder, s implydepress the f inder re lease but tonand, at the same t ime, s l ide thefinder backwards where it canbe detached.* Read instruct ions supppl iedwith the opt ional f inders ontheir use.

A. The aperture r ing is rotated,in e i ther d i rect ion, to set therequired F/number opposi te thewhi te index dot . The aperturer ing c l ick-stops at the numberedset t ings, as wel l as intermediate112 stop set t ings. The aperturer ing may also be set midway be-tween tne 112 stop c l ick-stops,too.

* The intermediate ' l 14 stop

set t ings cannot be used whenf inders wi th a bui l t - in exposuremeter are used. Cl ick-stop set-t ings only can be used, in th iscase.

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* When using f inders wi th abui l t - in exposure meter, expo-sure measurements should notbe taken wi th the depth of f ie ldpreview lever depressed, as theshutter speed indicated wi l lcause over-exposure. This is be-cause proper exposures are ob-ta ined wi th exposure measure-ments made at the f u l l aperture.

The lens is focused on the sub-ject , by rotat ing the focusingr ing in e i the r d i rec t i on , wh i lechecking the ef fect on the cen-tral matte surf ace area of thefocusing screen (standard type).

B. The Zenzanon-PG Series in-terchangeable lenses have fu l lyautomat ic lens d iaPhragmswhich means that the focusingscreen is a lways v iewed at theful l aperture, wi th the br ightestpossib le image. Depressing thedepth of f ie ld preview leverstops the lens diaphragm downto a pre-selected lens openingand permits checking of thedepth of f ie ld ef fect on thefocusing screen.

* The aperture r ing must not beadjusted whi le the dePth of f ie ldpreview lever is being depressed.

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A. To adjust the lens to therequired distance, wi thout useof the f inder, s imply rotatethe focusing r ing and set thedistance opposi te the orange-colored index.When the lens is focused, thereis an apparent zone of sharp-ness, both in f ront and back ofthe focused plane, which isknown as the depth of f ie ld.

* See the depth of f ie ld tablefo r the Zenzanon-PG 100mmlens on page 37.

B. The depth of f ie ld scale,next to the distance scales,shows the zone of apparentsharpness at any lens openingor d istance and is made up ofident ical pairs of apertures onboth s ides of the distance index.These ident ical pairs of aper-tures indicate the distance thatwi l l be in focus at these aper-tures. For example, i f the 100mm lens is focused at a d istanceof 3 meters, it can be seen f romthe depth of f ie ld scale that thezone w i l l ex tend f rom2.2 to 4 .8meters, when a lens opening ofF22 i s used .

In inf rared photography, someadjustment is required in thefocus in order to retain sharp-ness on the f i lm, because theinvis ib le inf rared rays are longerin wave length than the v is ib lerays used for focusing.For inf rared photography : -1 . Use an R f i l t e r o r equ iva len twi th an inf rared (b lack-and-wh i te ) f i lm .2. The red-colored l ine, next tothe orange-colored distance in-dex, is the infrared index.3. Af ter focusing in the normalmanner, re-set the distance in-dicated by the orange-colored

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221 Flash Fhotography

i ndex to the in f ra red index , bysh i f t ing the d is tance r ing .For example , i f the d is tance in -dicated by the orange-coloredindex is 3 m, when the lens isfocused on the subject, re-set3 m to the red-colored infraredindex, by shi f t ing the distancer ing wh ich w i l l focus the lensproper ly at 3 meters for the in-f rared f i lm loaded in the camera.' r Fol low instruct ions enclosedwi th the f i lm and f i l te r and, tobe on the safe s ide, make severalbracket ing shots. In general , i tseems safer to give more expo-sure than less, in th is case.

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A. Always use f lash cords wi tha standard PC type plug, wh ichshou ld be connected to the f lashsynch socket on the f ron t o f themain body .

* When detach ing the f lashcord , g r ip the p lug f i rm ly andpu l l i t out st ra ight , instead ofus ing a tw is t ing ac t ion .

B. The Zenzanon-PG lenses havea between- lens leaf shut ter wi thX-se t t ing fo r f lash synchron iza-t r o n .Th is means tha t e lec t ron ic f lashun i ts can be used and w i l l syn-chron ize a t a l l shu t te r speedsett ings, up to 1/500 second.F lash f i l l - in fo r day l igh t sho tsare a lso made very eas i l y , too .


t t t , .

C. When the ded icated Speed-L igh t G1 fo r the Zenza Bron icaGS-1 is used in combina t ionwi th the Speed G r ip G, i t w i l lbe possib le to contro l the f lashexposure by di rect ly meter ingthe f l a sh i l l um ina t i on a t t he f i lmp l ane.

* See ins t ruc t ions fo r the ded i -cated Speed-Light G1 for use oft he equ ipmen t .

A . To make mul t ip le exposures ,ro ta te the f i lm w ind ing c rank toadvance the f i lm and cock theshut te r . Then, tu rn the mul t ip leexposure lever in the arrow-ind ica ted d i rec t ion . When theshutter re lease but ton is de-pressed, in th is condi t ion, theshutter wi l l be re leased anynumber o f t imes w i thout ad-vanc ing t he f i lm .

B . Upon t ak i ng t he mu l t i p l e -exposed picture, be sure to re-tu rn the mul t ip le exposure leverback to i ts vert ical posi t ion.Otherwise, there wi l l be addi-t iona l mu l t ip le exposures on thesame frame.

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241 Mirror Lock-Up

When the mirror lock-up lever isreversed, upon suspension ofshoot ing wi th the mirror lockedup, the shut ter wi l l be re leased.Therefore, shoot ing should becont inued, in th is case, by thefol lowing methods.

A . Fo r shoo t i ng w i t h t he m i r r o rlocked up , f i r s t , ro ta te the f i lmwind ing c rank and advance thef i lm and cock t he shu t t e r . Then ,tu rn the mi r ro r lock-up lever inthe ar row- ind ica ted d i rec t ion ,wh ich w i l l c lose the lens shut te rdown comple te ly and swing upthe re f lex mi r ro r and f i lm sa fe typ la te .

* Read ins t ruc t ions supp l iedw i t h t he f i nde r w i t h bu i l t - i nexposure meter for AE (auto-mat ic exposu re) photographywi th the mi r ro r locked up .

@

B. The shut te r w i l l be re leasedwhen the shut ter re lease but tonor Electro-Magnet Cable Releaseis pressed.

* When suspend ing fu r thershoot ing w i th the mi r ro r lockedup, reverse the mirror lock-uPlever before rotat ing the f i lmw ind ing c rank .The shut te r w i l l be re leased anYn u mber of t imes, wi th mirrorlocked up and advanc ing thef i lm ( leader paper ) , when thef i lm w ind ing c rank is ro ta tedaf te r tak ing the f ina l exposure .

/ Therefore, reverse the mirrorIock-up lever before rotat ing thef i l m w i n d i n g c r a n k .


C. Reverse the mirror lock-uplever.One f rame wi l l be exposed and,therefore, wasted.

D. Cover the lens w i th i t s lenscap and then reverse the mirrorlock-up lever.Then, take the nex t exposure ,w i th the mul t ip le exposure levertu rned. Reverse the mu l t ip leexposure lever, upon taking thep ic tu re . (See "Mul t ip le Expo-sures" on page 27 .1

E. Ut i l i ze f i lm back in te rchange-ab i l i t y and de tach the f i lm backbefore revers ing the mirror lock-up lever . Then, a t tach the f i lmback and cont inue shoot ing inthe normal manner .(See "At tachment and Removalo f F i lm Backs" on page 9 . )

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The Zenza Bronica GS-l has anelectro-magnet ic shut ter re leasesystem which means that theusual cable re lease cannot beused.A Zenza Bronica Electro-MagnetCable Release is avai lable forth is purpose, a l though i t is a lsopossible to use any cable releasew i th a 2 .5mm min i -p lug , such asthose avai lable in photographicequipment stores.

* Always check operat ions be-fore actual ly using such cablere leases.

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A. The focusing screen can beexchanged, depending on thetype of photographic work be-ing under taken .First , remove the f inder at tach-ed to the camera main body.Then, move the screen removallevers on both s ides in thearrow-indicated di rect ions, asi l l us t ra ted . Then , us ing a p ince ro r s im i la r too l , l i f t up the sc reenwith the protrusion at the reare n d .

B. To instal l the focusingscreen, nest the protrusion atthe rear end of the screen in acorresponding groove on thecamera main body. Then, s l ideboth screen removal leversforward to secure the focusingscreen.

* l t wi l l not be possib le to at-tach the f inder, i f the screenremoval levers are not in theirforward posi t ions.* There are seven interchange-able focusing screens for theZenza Bronica GS-1 .


Mat te (S tandard type) M ic ropr ism/Sp I i t - i mage Spl i t - image

M i c r o p r i s m G r i d - l i n e s Mat te ( fo r 6x6 & 6x4.5 fo rmats )

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A. Pul l the re lease lever on thebase of the f i lm winding crankassembly outwards and, at thesame time, rotate the base in thecounter-c lockwise di rect ion andthe f i lm w ind ing c rank assemb lywi l l become detached.

* Upon detaching the f i lmwinding crank assemblY f romthe main bodY, Place the cover,which is suPPl ied wi th theSpeed Grip G, over the exPosedbayonet mount to Protect i tf rom dust and foreign matters.

B . To a t tach the f i lm w ind ingcrank assembly to the mainbody, f irst, remove the coverfrom the bayonet mount. Then,al ign the base of the f i lm wind-ing crank assembly to the bayo-net , insert and then rotate inthe c lockwise di rect ion unt i lsecurely at tached.

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U -shaped' r i n gP l a s t i c r i n gcover

B. Next , p lace the plast ic r ingcover over the U-shaped r ing, asi l l us t ra ted .

A. Fi rst , insert the U-shapedr ing into the neck strap eyelet ,as i l l us t ra ted .

C. Next , thread the neck strapthrough the plast ic r ing cover(and the U-shaped r ing) and pul li t ou t , as i l l us t ra ted .

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29 | Facts About the Battery

B u c k l e

D. Af ter adjust ing the lengthof the neck strap, pass the lead-ing end of the strap through thebuckle, as i l lustrated, which wi l lf ix i t securely.

* There should be no s lack inthe strap between the buckleand the plast ic r ing cover, or in"A" section, which means thatboth straps rnust be of the samelength at th is point .

The battery supplies power forthe various electronic controlmechanisms incorporated in theZenza Bronica GS-l . When usedincorrect ly , there is possib i l i tyof the wrong exposure being setto the camera and/or the cameranot operat ing.Be sure to use and store thebattery correctly for obtainingoptimum performance from itat a l l t imes.

* Take the battery out of thebattery chamber when storingthe camera.* Leaving the battery in thecamera for a long t ime, wi thoutusing it, oan lead to leakageproblems and result in poorcontact.Discard a battery with leakageor corrosion and thoroughlyclean out the battery chamber,before inserting a new battery.* Clean the contacts of thebattery chamber and batterywith a soft cloth. Don't usesandpaper or emery c loth.

* Don't throw the battery intoa f i re, or h i t i t s t rongly, as thereis danger of explosion.* Either a silver oxide battery(Nlo. 5441PX2814G13) or analkaline manganese batterY(A54414LR44) is used with theZenza Bronica GS-l. Both havevery good cold weather resist-ance. However, there is a tend-ency for performance to droPwhen the temperature falls be-low oo c (32' F ). Therefore,make it a rule to use a new bat-tery and/or keep replacementbat ter ies on hand for shoot ingoutdoors in f reezing weather.Keep the battery (and camera)under cover, next to the body,and load just before beginningthe session and/or , preferablY,use the optional Remote CameraBattery Pack E.

@- .iui.il-i.,;,,: . -, '-dsk- i"'j*risk* ,


301 Pointers on Shooting 3 | | 8il'",?t'8E-i'""* The shutter cannot be cockedwhen f i lm is not loaded in thef i lm back. The use of the mul t i -ple exposure lever will, however,permit you to cock the shut ter ,in such instan@s. This featureis, of course, very convenientfor fami l iar iz ing yoursel f wi ththe camera and for testing theshutter in f lash photography.(See "Mul t ip le Exposures" onpage 27.1* Battery power is not con-sumed when time (T) exposuresare made.* The lens shut ter remains openwhi le the shut ter re lease but tonis depressed on B (bulb) settingand, of course, battery power isalso consumed. Therefore theuse of time exposure is recom-mended when exposures arelonger than one minute on B(bu lb ) .* The focusing screen is inter-changeable. However, do notplace t r imming masks or tapeson the bottom surface of thescreens, as this will lead to in-accurate focusing.* A shutter release warningLED wi l l f lash above the focus-

ing screen, in the top center ofthe f inder, and s ignal c losing ofthe shut ter when the shut terrelease button is pressed. Waitfor th is s ignal , especia l ly at s lowshutter speeds, before rotatingthe f i lm w ind ing c rank .* There wi l l be no shut ter re-lease action when there is nobattery power. However, it wil lbe possible to release the shut-ter at a mechanical ly-contro l led1/500 sec. by revers ing the mir-ror lock-up lever, af ter lockinguo the mirror f i rs t .* When taking pictures, remem-ber that the f inal pr int wi l l becut down somewhat, especiallywhen pr inted in the economysize, because of the maskingused in commercia l photof in ish-ing equipment. Therefore, leavespace on al l s ides when takingthe picture.* When using a f inder wi th abui l t - in exposure meter, a lwaysremember to adjust the ASA/ISO f i lm speed d ia l o f t he f i lmback for the f i lm loaded.

* Restr ic t c leaning of the re-f lex mirror to b lowing or brush-ing wi th the blower brush or asof t camel hair brush. Don' ttouch the surface wi th yourf ingers or a c loth.* Use lens c leaning t issue andl iquid to c lean the surface ofthe lens. Do not use s i l icon-coated c loth for th is purpose, asi t wi l l prove detr imental to thelens coat ing.* Clean the plast ic focusingscreen in the same manner.Don't touch the surface as youmay leave f ingerprints.* Do not wipe the lacqueredexter ior of the main body, etc. ,wi th a lens c leaner, a lcohol ,th inner , e t c . , bu t l im i t c lean ingto wiping wi th a s i l icon-coatedcloth or a c lean sof t c loth.* Protect your camera f romtemperature changes which canresul t in moisture condensat ion,frost, etc., inside the body, lead-ing to rust ing of metal l ic partsand t roubles.* Protect your camera f romimpact and v ibrat ions, too.* Upon at taching the f i lm back,always pul l out the dark s l ide

@. *"*i"ts . -: ,- \. , . l : . . - , * - k i : d 6 n i # - -


f rom i ts s l i t .* Always protect the lens wi thi ts cover, when carry ing thecamera.* Clean the camera and lensvery careful ly af ter using i t out-doors in wet weather or at theseashore.* Wipe the camera careful lyw i th a we l l -wrung damp c lo th ,using f resh water, i f the exter ioris ef fected by sal ty a i r . Then,wipe i t d ry wi th a sof t , drycloth. l f necessary, send i t outfo r a qu ick inspec t ion a t an au-thor ized repair stat ion.* l f the equ ipment i s no t be ingused for a long per iod, storeevery th ing in t in - l ined conta in -ers, wi th p lenty of desiccant ,such as s i l i ca ge l . F ina l l y , s to rethe equipment in a cool , dryand we l l -ven t i la ted (bu t no tw indy) p lace .* Do not thread too strongly,when using a longer- than-standard tr ipod screw, as youmay damage the body.* Both camera main body andlens must be in the "cocked"condi t ion to at tach or removethe lens . In o ther words , thecock ing p in o f the lens must be

set between the red band andgreen do t , in th is case, wh i le thecock ing p in o f the body mountmust be set to the green-coloreddot .When not set as above, move thecock ing p in o f the lens manua l lyto the green-coiored dot andro ta te the f i lm w ind ing c rank tose t the cock ing p in o f the mainbc.rdy mount.' r A brown-colored f lex ib lepr in ted w i r ing w i l l be seen, a tthe h inge sec t ion , when theback cover is opened. Do notpu l l , cu t o r o therw ise damage i t ,as i t i s used fo r t ransmi t t ing theASA/ ISO data .

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Zenzanon-PG 100mm F3.5

o e l;-tb0 7 6

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0.79 0.14

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0,95 0 86 0.71 013t t + -

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Zenzanon-PG S0mm F4.5 65mm F4 10omm F3.5No. o f g roup€ lement 8 - 1 1 7-9 4-6Angle o f v iew 930 69.5" 4go

Apertures 4.5-22 Mlha l f c l i ck ) 4 -22 (w /ha l f c l i c k ) 3.5 - 22 fu lhal f c l ick)Min imum focus ing d is tance (m) 0.5 0.6 0 .75

F i l t e r s i ze (mm) 95 72 7 2Overa l l l eng th , We igh t (mm.g ) 71 .Ox Q87 , 715 67 .5x Q87 , 630

Equ iva len t foca l leng th in35mm format camera (mm) 25 33 50

Shutter S e i k o # 0 ( E l e c t r o n i c c o n t r o l ) T . 8 . 1 6 - 1 1 5 0 0 s e c . . A

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I

It l

Zenzanon-PG 150mm F4 200mm F4.5 250mm F5.6

No. o f g roupe lement 5 - 5 5 - 6 5 - 6A n g l e o f v i e w 33" 25.50 20.50

Apertu res 4L22 (w /ha l f c l i c k ) 4 .5 - 32 (w/ha l f c l i ck ) 5 .6 - 32 (w/ha l f c l i ck )

M in imum focus ing d i s t ance (m) 1 . 5 2 3F i l t e r s i ze (mm) 72 82 82Overa l l l eng th , We igh t (mm.g1 62.0 x Q87 ,650Equiva len t foca l leng th in35mm format camera (mm) 7 5 1 0 0 125

Shutter Se i ko #0 (E lec t r on i c con t ro l ) T . B . 16 - 1 / 500 sec . . A

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R\p"[ffi**'\ly

Hh B GS 2m (6x 7)

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