Film cameras
Bronica GS-1 Prism Finder User manual
User manual for Bronica GS-1 Prism Finder. 26 pages in English. Read the original PDF, download or print a copy without registration.
26 pagesEnglish3.0 MB PDF
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Document details
- Brand
- Bronica
- Model / document
- Bronica GS-1 Prism Finder
- Document type
- User manual
- Language
- English
- Pages
- 26
- File size
- 3.0 MB
- Category
- Film cameras
- Document date
- Not specified in catalog
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Page 4 · Read text
Magnification 087x, with standard 100mm lens
Finder field 52.3 x 649mm l94o/ox94%l
Eyepiece diopter Standard magnifier is -1.5 diopters; corrections from
45 to +2.5 diopters are possible by exchanging the
magnifier.
Exposure measuremsRt Tf L (thru-thelensl 'f ull apertur€ exposure measure-
rnents; full area average readings, with two silicon
photocells.
Shutter speed range 16 seconds to 1/500 second, with coupling in 1/8th
steps on AUTO.
,Exposure measur€ment range EV2 - EV17 (ASA/|SO100)
Film sensitivity range ASA/ISO 3 to 6,400
Exposure compensation I 3 steps,in 1/3rd increments.
Exposure control mode Aperture€riority automatic exposure (AEl and
manual .
Finder indications 5 digit 7 segment LEDs.
Aperture-priority AE - Shutter speeds, with inter- 'l mediate 12 stop speed also indicated between 112 to
1 /500 sec.
Manual - Preset shutter speed, as well as difference
against proper exposure setting.
Other indications - AE lock, shutter release warning
and flash readylight which are indicated with LED
dots; brightness of 7 segment indication is auto-
matically switch becomes brighter for shutter speeds
faster than 1 sec. and becomes darker for shutter
speedsslower than 1 second.
@View original page 4Page 5 · Read text
AE lock
Dimensions 3-:,,iff-;ilJu;""r"#;, ronsx 58mmhish (excrudins
rubber eyecup)
Weight 460 grams
The above specifications are subiect to changes without prior notice when necesary
for the purposeof improvingperformance.
www.orphancameras.comView original page 5Page 9 · Read text
A. To detach the finder or B . Before attach ing the A E
the f inder cover on the Prism Finder G, f irst, wipe
camera body, simply depress the contacts on both the
the f inder release button, camera body and the finder,
while, Et the sttme time, with a soft cloth, to obtain
sliding the f inder or the optimum contact.
f inder cover backwards
where it can be taken off.
www.orphancameras.comView original page 9Page 10 · Read text
C. To attach the AE Prism D. To detach the AE Prism F irst, push the main switch
Finder G, simply align the Finder G, refer to the in- on the main body down
front end of the f inder struction in A. (ON ) . Then, stroke the
with the f inder f rame (the shutter release button half-
shiny rectangular frame on ways. lf the battery is in-
top), as illustrated. serted correctly and there is
Then, gently lower the sufficient battery power for
finder and, when well seated, operations, the LED display
slide forward until it locks in the finder will light up
into pface. steadily or flicker as the
case may be. (See page 8 of
the instructions for the
Zenza Bronica GS-1).
@View original page 10Page 11 · Read text
A. To set the AE Prism B. Push the main switch on
F inder G for aperture- the carnera main body down
priority AE operations, set (oN).
the shutter speed dial to 'tAt'. First, press the shutter
speed dial lock button and
rotate the shutter speed dial,
at the same time, to set "At,,
in the shutter speed scale
window.
www.orphancameras.comView original page 11Page 12 · Read text
O O 500=
.540
Shutter Shutter lE,,: ..
Speed release
warn Ing
C. Next, rotate the aperture D. To check the shutter E. When the proper ex-
ring and set the required F I speed setting, stroke the posure setting is beyond the
number opposite the white shutter release button half- range of shutter speeds
index dot. The aperture ring ways and it will be indicated coupling f or AE exposure
has click-stops at the num- in the LED display in the operations,"500" will filcker
bered settitrgs, as well as finder, in 3 digits of 7 seg- at 4Hz when there is over-
intermediate 112 stop set- ments. The shutter speed exposure greater than 1/500
tings. will be indicated in 112 second and "16" will f licker
t The aperture ring cannot settings (between 1/500 to when there is underexposure
be used between click-stops 1 12 sec.),too. greater than 16 seconds. In
for AE operation$. See the following table for such cases, rotate the aPer-
the scope of the indication ture ring until the required
for the proper exposure. shutter speed is disPlaYed.
@View original page 12Page 14 · Read text
.5DD
A. Sfide the AE lock button, + The AE lock will hold
on the AE Prism Finder G, the memorized shutter speed
forward and then stroke the setting for 16 seconds after
shutter release button half - which it wf l automatically
ways, which will actiwte the g o O F F .
AE lock and memorize the lf the shutter releasebutton
shutter speed setting. The is not pressedin this time, it
AE lock orong€-colored LED will be necessary to take
will also light up on the left another reading and activate
end of the LED d isplay in the AE lock.
the finder.
@View original page 14Page 15 · Read text
B. Upon completing AE A. Push the main switch on
lock operations, reverse the the camera main body down
AE lock button. (oN).
Or, push the main switch up Manual exposure operations
(OFF), when it is reguired to are possible in the aperture-
priority mode or the shutter release the AE fock before
I the 16 secondholding period speed-priority mode. rs over.
II
www.orphancameras.com @View original page 15Page 16 · Read text
at ar\- t a-a o 500 J
B. Rotate the aperture ring C. Set the shutter speed dial D. Stroke the shutter release
and set the required F/num- on the main body to any set- button halfways, and the
ber to the wh ite dot index. ting, excluding " A" , First, shutter speed set will flicker
The ring should be set to the press the shutter speed dial on the LED display in the
numbered settings and inter- lock button and, then, turn finder, together with a two
mediate 1/2 stop settings, the shutter speed dibl at the digit number to its right. The
which have click stops. same time to the required 2 digits are illuminated t' The aperture ring should setting. All settings, except steadily and indicate the dif-
not be set between click- "A", have click-stopsand do ference from the proper ex-
stops, when using the AE not require pressing the posure, in 1/2 stop incre-
Prism Finder G. lock button for setting. ments, up to t 3 stops. When
the difference is more than
t 3 stops, 3 or -3 will beView original page 16Page 17 · Read text
E . When over(+) or u nder A.'Set the required shutter B. Exposure measurement
(-) is displayed in the speedsetting, by rotating the by stroking the shutter re-
f inder, rotate the shutter shutter speed dial on the lease button halfways is the
speed dial until "O" is dis- camera main body. same as in the case of
played. aperture-priority manual ex-
posure operations,
@
www.orphancameras.comView original page 17Page 18 · Read text
*C. Rotate the aperture ring Do not pressthe depth of 'tO"and display in the f ind- field preview lever during
er, in the same manner as exposure measurement,
for aperture-priority manual when using the AE Prism
exposures. Finder G for both aperture-
priority and shutter speed.
* Use the aperture ring on priority man ual exposure
click-stops only, which operations, since the shot
means that 1/2 stops can be will be over-exposedby the
used but 1/4 stops cannot be difference between the in-
used. dicated setting and the full
aperture"View original page 18Page 19 · Read text
. 5 0 A J o .
B. Exposure compensation
is not possible with the
A. To set the required com- exposure compensation dial
pensation, slide the exPo- of the f ilm back, when expo-
sure compensation dial lock sure adjustments are made
button, in the direction in' manually. In this case, read
dicated by the arrow, and, the two digits of the finder's
at the same time, rotate the LED display which indicate
exposure compensation dial, the difference from the
as required. proper exposure and either
The table shows the ex- rotate the shutter speed
posure compensation range d ial (t stop increment) or
which is possible when the apefture ring {1 12 stop in-
ASA/ISO film speed dial is crement) until the desired
set at the low or high sen- exposure compensation is
sitivity end. obtained. @
www.orphancameras.comView original page 19Page 21 · Read text
o The shutter speed in- o How to use the Table: o Exposure Measuring
dications are read: lf EV 14 is the correct Range
15-165: 1 second to 16 exposure, with ASA/Iso The exposure measuring
seconds. 100 film, the shutter range with the AE Prism
2 - 500: 1/2 second to speed setting will be Finder G is EV2 to EVl7
1 /500 second 11250 sec., when F/8 is (with ASA/ISO 10O film).
set to the aperture ring. EV, or exposure rralue, is
(See the thick red lines a combination of shutter
drawn on the table.) speed and aperture lFl
lf the aperture should be number), as determined
set to F111, in the above by the film speed and the
case, it can be seen that intensity of the light.
the shutter speed setting
will become 1 /125 sec.
A "brightness of EV 14"
is the brightness outdoors
on a bright sunny day.
@
www.orphancameras.comView original page 21Page 22 · Read text
/ l
C=
Display S P C X 2 MeterSensitivityPattern
Panel Optical Path Drawing
Exposure Measuring Plane Exposure Measuring Sensitivity Pattern
Two silicon photocells (light receptor cells) Since the AE Priim Finder G has a full
are located in the position illustrated. Since apefture exposure measuring system, it has
they are attached parallel to each other, the sensitivity pattern illustrated no matter
the meter sensitivity pattern is that shown what the aperture setting. In the above
to the right. pattern, the numbers indicate the ratio of
sensitiviry for the zones. Thus, if the sen-
sitivity of the innermost "10" zone is con'
sidered to be 100, the outermost "6" zone
is 6O%.
5View original page 22Page 23 · Read text
A. The standard magnifier B. To exchange magnifier, C. To attach the replace-
supplied with the AE Prism f irst, detach the eyecup. ment magnifier, simply place
Finder G has a power of Then. unscrew the setscrew the bottom edge of the
-1 .5 diopters. When found on the magnifier frame and frame into position and then
unsuitable, however, it can it will be possible to remove screw in the setscrew at the
be exchanged for one of the rnagnifier together with top of the f rame.
seven optional magnifiers the frame.
with powers of -4.5, -3,5, D . Finally , replace the eye-
_2.5, _{.5, +O.5, *1 5 and cu p.
+2.5 d iopters.
@
www.orphancameras.comView original page 23Page 24 · Read text
Use the camera on a solid triPod or A shutter releasewarning LED lights up
otherwise steady it, if the displayed momentarilyin the LED displayoverthe
shutter speed is a slow one, i.e., 1/30 screen area, when the shutter release
second or slower. button is pressed,whether operationsare
For the scope of the shutter speed value manualor auto.indicated, in the case of auto€xposure The t-ED signals that the exposure is
operations, see the table on page 11 .. completed and the shutter blades have
Cover the finder with a black cloth to closed.When usinga slow shutterspeed,
prevent light entering through th6 eye' rotate the film winding crank after the
piece, when not looking through the LED lights up; otherwisethere will be
finder during auto-exposure operations. under-elposure if the film winding
Battery consumption is very great when crank is rotated before the LED lights
auto-exposure operations are made with up. Furthermore,the shutter will not be
the lens covered by its cap or under ex' releasedon the following ehot until the
tremely dark conditions. remainingtime for the previousexposure
Save battery power, by turning the main haselapsed.
switch OFF between shots or when not The fiist shot of AE operation with AE
using the camera. lock and the mirror lockedlp is
Use the AE Prism Finder G on Manual possible. However, the consecutive
for flash photography, as there is danger mirror lockedtp shot can not be taken
of overexposures when used in the auto' by AE. Therefore,when the continous
expsoure mode. mirror lock+.rpoperations are desired,
turn to Manualmode.View original page 24Page 25 · Read text
Cleaning of the magnifier and prism Wipe and clgan the accessorv very care-
should be restricted to blowing with the fully after using it in wet weather or at
blower brush, after which lens cleaning the seashore.
tissue and tiquid should be used to lf the accessory has been exposed to
lightly wipe the surfaces. salty air (or water), wipe the exterior
Do not use silicon-coated cloth, as it carefully with a well-wrung damp cloth
will prove harmful to the coating. (using fresh water). Then, dry with a
However, use the silicon'coated cloth, or soft, dry cloth. And, have the accessory
a soft cloth, to clean the exterior of the inspected at the authorized repair sta'
accessory and never use solvents,such as tion, if necessary.
lens cleaning liquid, alcohol or thinner, Store the accessory in a tinjined con'
for this purpose. tainer, with plenty of desiccant,such as
Do not leave the accessory for a long silica gel, if it is not being used for some
time in extremely hot locations, such as time. And, store in a cool, dry and well-
summer beach or car parked in the sun, ventilated (but not windy) location,free
as the accessorymay be affected, leading of naphthalene and/or camPhor.
to improper exposure measurementsand
even to damage.
Should the camera and accessory be-
come over-heated, under the above cir''
cumstances, let them return to the am'
bient temperature level before using
them.
@
www.orphancameras.comView original page 25From the M. Butkus archive. Original publisher and archive notices are retained.
Check the model and edition against your equipment.
PDF verified 2026-10-10.