Film cameras
Bronica GS-1 Tele Converter User manual
User manual for Bronica GS-1 Tele Converter. 13 pages in English. Read the original PDF, download or print a copy without registration.
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Document details
- Brand
- Bronica
- Model / document
- Bronica GS-1 Tele Converter
- Document type
- User manual
- Language
- English
- Pages
- 13
- File size
- 1.3 MB
- Category
- Film cameras
- Document date
- Not specified in catalog
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Page 3 · Read text
: ! Contents
The Tele-Converter G has been specifically designed and de-
veloped as an integral accessory for the Zenzanon pG Series S p e c i f i c a t i o n s . . . 2
fensesand when used between the Zenza Bronica GS-l and the l n c o m b i n a t i o n w i t h b i i - J i " " ; . : . : : 3
Zenzanon PG Series lens, extends the focal length of the prime N o m e n c l a t u r e . . . 4
(master) lens, by 1.4 times when the Tele-ConverterG1.4X is 1. Attachment/Detachment (Method 1) 6
used and 2 times when the Tele-ConverterG2X is used, with- 2. Attachment/Detachment (Method 2) . . . 10
out changing the minimum focusing distanceand with only a 3 . F o c u s i n g . . . . , . . . 1 5
decreaseof one stop when the Tele-ConverterG 1 .4X is usedand 4. ExposureCompensationfor the G2X . . . 16
two stops when the Tele-ConverterG2X is used in the effective 5 . E x p o s u r e C o m p e n s a t i o n f o r t h eG 1 . 4 X . . . . . . ' 1 7
aperture value, 6. Pointerson Usingthe G2X . . . . . 19
There is no loss of automatic diaphragm action, as well as no 7 . P o i n t e r so n U s i n gt h e G 1 . 4 X . , . 2 O
change in the TTL exposure metering system with those 8, Care of the Accessory . . . , 21
f inders having a built-in metering system, becausethe coupling
mechanismsare built into the accessory. This means that all
Zenzanon PG lenses, as well as all accessory finders, can be
used without any changes in operations, even when the Tele-
Converter G is used.
To get best results from the Tele-ConverterG, please read the
instruction manual carefully before even touching the acces-
sory, as this will help increaseyour pleasurein using it with
the Zenza Bronica GS-l and Zenzanon PG lenses.
Two attachment/detachment methods are possible with the
Tele-Converter G. In Method 1, the accessoryand lens are
attached separatelyand also detached separately. In Method 2,
the lens and accessory are, first, attached together and then
attached to the body, with detachment in the reverseorder.
oView original page 3Page 4 · Read text
Specifications in bination ffth PrimCLens
Tele-GonverterG2X Tele-ConverterG2X
Magnification: 2X Focal length: Double that of prime lens
Lens Construction: 7 elements in 6 groups Aperture coupl ing range; Fully automatic lens dia-
(multi-coated) phragm action from F3.5 to
Lens diaphragm action: Coupled to fully automatic lens F45 (with effective F/values
diaphragm action of F7 to F9O)
Metering system: Coupled to TTL full aperture ex- Photographic magnification: Double that of prime lens
posure measuringsystem Depth of field: One-half that of prime lens
Exposure factor: 4X (2 F/stops) Minimum focusing distance: Same as prime lens
Overall length: 64.4mm
Maximum diameter: 89mm Tele-ConverterG1.4X
Weight: 6€0 grams Focal length: 1.4 times that of prime lens
Aperture coupling range: Fully automatic lens dia-
Tele-ConverterG1.4X phragm action from F3.5 to
Magnif ication: \,.4X F45 (with effective F/values
Lens Construction: 5 elements in 5 groups of F4.9 to F64)
(multi-coated) Photographic magnifcation: - 1.4 times that of prime lens
Lens diaphragm action: Coupled to fully automatic lens Depth of field: V1.4 times that of prime lens
diaphragmaction Minimum focusing distance: Same as prime lens
Metering system: Coupled to TTL full aperture ex-
posure measuringsystem Recommended prime lenses :
Exposure factor: 2X (1 F/stop) Zenzanon PG 1Oomm, 11Omm, 15omm,200mm,250mm
Overall length: 29mm and 5o0mm lenses (excluding Zenzanon pG 50mm and
Maximum diameter: 89mm 65mm lenses)
Weight: 420 grams
@ www.orphancameras.com oView original page 4Page 12 · Read text
6 leointerson Usingthe G2X
exposurefactor of 2x. auto-flash rangewill be 111.4 A. Using the Tele-Converter ing screens Matte Screen G
* When adjusting the aper- of the distance indicated on G2X with lhe Zenzanon PG and Grid-Line Screen G are
ture, open up by one stop. the exposure calculator. For 500mm lens gives the pho- recommended with the Tele-
Or, if adjusting the shutter example, when the film has tographer a 1000mm focal Converter G2X because the
speed, use a setting which is a sensitivityof ASA/ISO 100 length lens. ln the same two stop light loss will make
one speedslower. and the aperture is set at F4, manner, the 150mm lens be- focusing with the split-image
C. When using auto-flash the auto-flash range of the comes the 30omm and the spot and microprism ring of
electronic units without the exposure calculator will be 20omm the 40omm lens. the standard focusing screen
TTL Auto Film Plane Flash 0.7 to 8 meters but should B. Although the focal length rather difficult.
Metering or when using be 0.7 to 5.6 meters when of the prime lens is doubled, E. The accessory is recom-
Speed-Light G1 on non-TTL the Tele-ConverterG1.4X is there is no change in the mended for use with Zen-
auto-flash operations, opgIl r used. In other words, when minimum focusing distance. zanon PG lenses f rom 100
up the lensopeningone stop the Tele-Converter G 1.4X is This means an increase in mm to 500mm but not with
more than indicated,in order used, the auto-f lash range close-focusing capabiI i ty. the shorter lenses. The 50
to compensatethe exposure, will be the same as when the C. Becauseof the 4x expo- mm and 65mm can, of
D. When using electronic{ aperture is decreased by one sure factor, conditions will course, be attached but a
flash units on "manual," the stop. be equal to using ASA/ISO certain amount of optical
correct exposure will be one 100 film when ASA/lSO 400 degradingwill take place.
stop faster than the one film is loaded in the camera. F. When the Tele-Converter
found by calculation f rom ln other words, simply di- G2X is used, there will be no
the guide number. Or, the i . t viding the ASAi 1SO f ilm quality loss in prime lens
guide number can be used at speed by four will give the perf ormance, except for
1/1.4 its true value. user an adjusted ASA/lSO those already noted, because
E. When using the SPeed- f ilm speed setting, for setting the accessory has been de-
Light G1 on TTL Auto Film exposuremanually. signed specifically for use
Plane Flash Metering, the D. Optional accessoryfocus- with the Zenzanon PG lehses.
(D www.orphancameras.com IDView original page 12Page 13 · Read text
: i l l l
However, it is always recom- lens opening, whenever opti- zanon PG lenses f rom 100 those already noted, becasue
mended that the lens be stop- mum performance is requir- mm to 500mm but not with the accessory has been de-
ped down about two stops ed. the shorter lenses. The 50 signed specifically f or use
from the maximum effective mm and 65mm can, of with the Zenzanon PG lenses.
course, be attached but a However, it is always recom-
7 | Pointerson Usingthe G1.4X certaindegradingamountwill takeofplace.optical stoppedmended thatdown theaboutlenstwobe j F. When the Tele-Converter stops f rom the maximum ef-A. Using the Tele-Converter In other words, simply divid-
G1.4X with the Zenzanon ing the ASA/ISO film speed Gl.4X is used, there will be fective lens opening, when-
PG 500mm lens gives the by two will give the user an no quality-lossin prime lens ever optimum performancephotographer a 700mm fo- " adjusted ASA/lSO film speed perf ormance, except for is required. { 'cal length lens. In the same setting, for setting exposure lmanner, the 1Somm lens m a n u a l l y . 8 | Care of the Accessory
becomesthe 21Omm and the D. Optional accessoryfocus-
200mm the 280mm lens. ing screens Matte Screen G A. The electrical contacts cessory, when storing or car- 'iB. Although the focal length , and Grid-Line Screen G are on the front and rear sur- rying it, to protect the pins
of the prime lens is extended recommended with the Tele- faces of the Tele-Converter and/or to prevent dust entry.
1.4 times, there is no change Converter G1.4X because G must be constantly clean- C. The Tele-ConverterG and
in the minimum focusingdis- the one stop light loss will ed, as dirty contacts can lead Automatic Extension Tube G
tance. This meansan increase make focusing with the to malfunctioning of the lens (or Automatic Bellows At-
in close-focusingcapability. split-image spot and micro- shutter, flash synchroniza- tachment G) should not be
C. Because of the 2x exPo- prism ring of the standard tion and coupling with the used connected. Further-
sure factor, conditions will focusing screen rather dif- finder with a built-in meter- more, the Tele-Converter G
be equal to using ASA/ISO f icult. ing system. must not be used with an-
100 film when ASA/ISO 200 E. The accessory is recom- B. Always cover the front other Tele-ConverterG, too.
f ilm is loaded in the camera. mended for use with Zen- and rear surfaces of the ac-
@ @ . t.:,iIView original page 13From the M. Butkus archive. Original publisher and archive notices are retained.
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