GS-1 Congratulations on your choice of the Zenza Bronica GS-1, a lens shutter type single reflex camera in the 6 x 7 format. The GS-1 provides the professional user with a lightweight and compact 6 x 7 format single lens reflex of extremely useful versatility and multi-functional performance, which is based on the history and experience gained in the development of the Zenza Bronica ETRS and SQ-A single lens reflexes, as well as the latest technological advances in the electronic field.
Contents Specifications of the Zenza Bronica GS-1 Parts of the Zenza Bronica GS-1 1. Loading the Battery 2. Main Switch 3. Finder Display and Battery Checking 4. Attachment and Removal of Film Backs 5. Construction of Film Back 6. Film Loading 7. Film Speed Dial 8. Exposure Counter 9. Film Type Indicator Frame 10. Exposure Counter 11. Film Winding/Shutter Cocking 12. Film Unloading 13. Setting the Shutter Speed Dial 14. Shutter Release Button 15. Time (T) Exposure 16. Exchanging Lenses 17.
Specifications of the ZENZA BRONICA GS-1 Type 6 x 7cm format lens, shutter single lens reflex camera with interchangeable lens, film back, finder and focusing screen systems. Frame Size 55.6 x 69.0mm (4:5 ratio matching the size of the photographic paper.) Film 120 roll film; 220 roll film; 135 roll film in film cartridges; and Polaroid Land Pack films (with exclusive film backs required for each film type.) Standard Lens Zenzanon-PG 100mm F3.
Specifications of the ZENZA BRONICA GS-1 (con’t) Film Back Daylight loading interchangeable type; exclusive film backs for 120 and 220 roll films (6 x 7, 6 x 6 and 6 x 4.5 formats) and Polaroid Land Pack film; with ASA/ISO film speed dial and exposure compensation dial (coupling to finders with built-in exposure meter. Finder Interchangeable type; shows 94% of the actual field of view (which does not change upon exchanging finders.
Parts of the ZENZA BRONICA GS-1 Finder release button Main switch Shutter speed dial lock button Film Winding Crank Depth of field preview lever Lens release button Neck strap eyelet Multiple exposure lever Electro-magnetic cable release socket Neck strap eyelet Film back release button Back cover release button (bottom) Dark slide slit Back cover release button (top) Film plane mark Aperture ring Depth of field scale Distance scales Focusing ring Lens alignment dot Flash synch socket LED disp
1. Loading the Battery The electronically controlled shutter and, of course, the electro-magnetic shutter release system will not work without loading the battery. Use one 6 volt silver oxide battery or alkaline-manganese battery. * The battery may be obtained at any photographic equipment or electrical appliance shop. A. Depress the battery chamber button with your finger and, at the same time, move the battery chamber cover in the arrow-indicated direction. The cover will come off quite easily. B.
3. Finder Display and Battery Checking (con’t) B. Turn ON the main switch and then stroke the shutter release button halfway. If the LED display in the finder lights up steadily or flickers, as the case may be, the battery is loaded properly and there is sufficient power for operation. * If the LED display does not light up steadily or does not flicker, (1) the battery is not loaded properly or (2) the battery is completely drained and should be exchanged. 4.
4. Attachment and Removal of Film Backs (con’t) A. To attach the film back to the main body, simply insert the latches at the upper end of the film back into the attachment openings at the upper end of the main body. Then, press the lower end of the film back against the main body until it locks securely. * The dark slide must be withdrawn from its slit, upon attachment of the film back to the main body, as otherwise the shutter cannot be released. B.
5. Construction of Film Back (con’t) B. The film back frame has a base with dark slide slit and a back cover with an ASA/ISO film speed dial, and exposure compensation dial and a film type indicator frame. The film back frame completely encloses the film holder and shields it from outside light, as well as connecting it to the main body and also coupling with finders with built-in exposure meters. 6. Film Loading A.
6. Film Loading (con’t) E. Rotate the manual film winder on top of the film holder in the arrow-indicated direction and wind up the film leader. When the starting point, or arrow-mark appears, align it with the triangular start-mark on the right-top side of the film holder. Then, stop rotation. F. The starting point can also be aligned with the start-mark, with the film holder loaded in the film back. In this case, simply rotate the film winding crank of the main body to align the start-mark.
6. Film Loading (con’t) I. The manual film winder is used to place the first frame into position, when the film back is detached from the main body. The manual film winder will not stop rotating, even when the film is in place for the first frame, but should be rotated 2 or 3 times more, in order to take up slack in the loaded film. * When loading 220 roll film in the Film Back GS 220, do not mistake the dotted line before the arrow-mark for the start-mark.
9. Film Type Indicator Frame Upon loading the film, tear off the end flap from the empty film package and insert it in the film type indicator frame. This will help you keep track of the film loaded in the film back, even when two or more film backs are used with different types of films. 10. Exposure Counter The exposure counter is an additive type which shows the number of frames exposed.
12. Film Unloading A. After the 10th exposure of the 120 roll film (20th exposure of the 220 roll film), continue rotating the film-winding crank and the film will only be advanced until the remaining film and leader paper are wound up on the take-up spool. Open the back cover when there is no resistance in the winding action. B. Remove the film holder and while preventing the loose film from unwinding, take out the take-up spool. Seal the exposed film and return it to its original box until development.
13. Setting the Shutter Speed Dial (con’t) C. The shutter speed dial is set to A, for aperture-priority AE photography when a finder with a built-in exposure meter is attached. To set A, press the shutter speed dial lock button and rotate the shutter speed dial at the same time. To change from A to another setting, for manual photography, press the lock button and rotate the shutter speed dial to the required setting.
. Time (T) Exposures Time exposures are made with the time exposure lever on the lens, regardless of the setting on the shutter speed scale. A. First, cock the shutter with the film-winding crank and then pull up the time exposure lever release. B. Slide the time exposure lever and release the shutter, when a redcolored "T" is exposed on the lens barrel. The shutter will stay open until the time exposure lever is moved in the opposite direction, exposing the letter "A", which will close the shutter.
17. Interchanging Finders A. Various types of optional finders can be interchanged to match shooting conditions to photographic conditions. To attach the finder, align the front end of the finder with the front end of the finder frame on top of the main body, as shown. Then, gently lower the finder and, when well seated, slide forward until it locks. B. To detach the finder, simply depress the finder release button and, at the same time, slide the finder backwards where it can be detached.
18. Setting the Aperture Ring (con’t) * When using finders with a built-in exposure meter, exposure measurements should not be taken with the depth of field preview lever depressed, as the shutter speed indicated will cause over-exposure. This is because proper exposures are obtained with exposure measurements made at the full aperture. 19.
21. Infrared Photography In infrared photography, some adjustment is required in the focus in order to retain sharpness on the film, because the invisible infrared rays are longer in wave length than the visible rays used for focusing. For infrared photography: 1. Use an R filter or equivalent with an infrared (black-and-white) film. 2. The red-colored line, next to the orange-colored distance index, is the infrared index. 3.
23. Multiple Exposures A. To make multiple exposures, rotate the film-winding crank to advance the film and cock the shutter. Then, turn the multiple exposure lever in the arrow-indicated direction. When the shutter release button is depressed, in this condition, the shutter will be released any number of times without advancing the film. B. Upon taking the multiple exposed picture, be sure to return the multiple exposure lever back to its vertical position.
24. Mirror Lock-Up (con’t) C. Reverse the mirror lock-up lever. One frame will be exposed and, therefore, wasted. D. Cover the lens with its lens cap and then reverse the mirror lockup lever. Then, take the next exposure with the multiple exposure lever turned. Reverse the multiple exposure lever, upon taking the picture. (See 23. Multiple Exposures.) E. Utilize film back interchangeability and detach the film back before reversing the mirror lock-up lever.
26. Interchanging Focusing Screens A. The focusing screen can be exchanged, depending on the type of photographic work being undertaken. First, remove the finder attached to the camera main body. Then, move the screen removal levers on both sides in the arrow-indicated directions, as illustrated. Then, using a pincer or similar tool, lift up the screen with the protrusion at the rear end. B.
27. Removal and Attachment of the Film Winding Crank Assembly The film-winding crank assembly must be removed when attaching the Speed Grip G to the Zenza Bronica GS-1. A. Pull the release lever on the base of the film-winding crank assembly outward and, at the same time, rotate the base in the counterclockwise direction and the film-winding crank assembly will become detached.
28. Attachment of the Neck Strap (con’t) C. Next, thread the neck strap through the plastic ring cover (and the U-shaped ring) and pull it out, as illustrated. D. After adjusting the length of the neck strap, pass the leading end of the strap through the buckle, as illustrated, which will fix it securely. * There should be no slack in the strap between the buckle and the plastic ring cover, or in "A" section, which means that both straps must be of the same length at this point. 29.
30. Pointers on Shooting * The shutter cannot be cocked when the film is not loaded in the film back. The use of the multiple exposure lever will, however, permit you to cock the shutter, in such instances. This feature is very convenient for familiarizing yourself with the camera and for testing the shutter in flash photography. (See 23. Multiple Exposures.) * Battery power is not consumed when time (T) exposures are made.
31. Care of the Zenza Bronica GS-1 * Restrict cleaning of the reflex mirror to blowing or brushing with the blower brush or a soft camel hair brush. Don't touch the surface with your fingers or a cloth. * Use lens cleaning tissue and liquid to clean the surface of the lens. Do not use siliconcoated cloth for this purpose, as it will prove detrimental to the lens coating. * Clean the plastic focusing screen in the same manner. Don't touch the surface as you may leave fingerprints.
31. Care of the Zenza Bronica GS-1 (con’t) * Both camera main body and lens must be in the "cocked" condition to attach or remove the lens. In other words, the cocking pin of the lens must be set between the red band and green dot, in this case, while the cocking pin of the body mount must be set to the greencolored dot. When not set in this way, move the cocking pin of the lens manually to the green-colored dot and rotate the film-winding crank to set the cocking pin of the main body mount.
32. Depth of Field Tables F/nu mbers 3.5 Meters oo oo 15 21.9 8 9.58 5 5.56 3 3.18 2 2.08 1.5 1.54 1.2 1.22 1.0 1.02 0.9 0.91 0.8 0.81 0.75 0.76 46.9 11.4 6.87 4.54 2.84 1.93 1.46 1.18 0.99 0.89 0.79 0.74 4 oo 41.8 23.2 11.1 9.82 6.75 5.64 4.49 3.21 2.82 2.09 1.92 1.55 1.46 1.23 1.17 1.02 0.98 0.91 0.89 0.81 0.79 0.76 0.74 5.6 oo 30.1 10.9 5.96 3.31 2.12 1.56 1.24 1.02 0.92 0.81 0.76 29.6 10.0 6.34 4.31 2.75 1.89 1.44 1.16 0.98 0.88 0.79 0.
33. Specifications of the Zenzanon-PG Lenses Zenzanon-PG 50mm F4.5 65mm F4 80mm F3.5 8 - 11 7-9 6-8 83 68.5 58.6 4.5~22 (w. half click) 4~22 (w. half click) 3.5~22 (w/ half click) Minimum focusing distance (m) 0.5 0.6 0.55 Filter Size 95 72 72 74 x ø98, 790 71 x ø87, 715 71.
33. Specifications of the Zenzanon-PG Lenses Zenzanon-PG Lens Construction (group-element) Angle of View Apertures Minimum focusing distance (m) Filter Size Overall length, Weight Equivalent focal length in 35mm format camera (mm) Shutter (con’t) 100mm F3.5 110mm F4 150mm F4 4-6 4-6 5-5 48 44.5 33 3.5~22 (w. half click) 4~32 (w. half click) 3.5~22 (w/ half click) 0.75 0.66 1.5 72 72 72 67.5 x ø87, 630 78.
33. Specifications of the Zenzanon-PG Lenses Zenzanon-PG (con’t) 200mm F3.5 250mm F4 500mm F4 Lens Construction (group-element) 5-6 5-6 10 - 11 Angle of View 25.5 20.5 10.3 4.5~32 (w. half click) 5.6~32 (w. half click) 8~64 (w/ half click) Minimum focusing distance (m) 2 3 8 Filter Size 82 82 122 97.5 x ø87, 970 142 x ø87, 1200 307.
