Zenza Bronica ERTSi

Extremely satisfactory photography, with a compact design emphasizing great handling ease. Creative picture-taking can not take place, even when the powers of expression are rich if there are too many limitations placed on the photographer. In the case of the ETR-Si however, special importance has been placed on this point and there is a high degree of system flexibility. Not only has a compact and light-weight camera been developed, based on Bronica's exclusive lens shutter system, but Bronica has advanced the use of electronics in various sophisticated functions, resulting in enhanced precision. And, the pursuit of greater holding stability has also lead to an improvement in handling ease. Furthermore, the very flexible "system" design of the ETR-Si, in which lenses, finders, film backs and focusing screens can be freely exchanged, as well as full range of valuable accessories makes it possible to customize the "system" to match the user's intention in picture-taking. These versatile functions in a very compact camera have been successful in greatly increasing the creative freedom in photography. (From Tamron site)

The ETR-Si, introduced in October 1989, is an improved version of the ETR-S. Compatibility between all previous accessories is nearly 100%.

The battery compartment door was enlarged, and is now the same as the SQ style. The Motor Drive E (now discontinued and replaced by the Winder Ei-II), will operate with the ETR-Si, but may require adjustment as the body is slightly wider than the ETR-S.
The focusing screens have a transparent window for the OTF LED information, but are forwardly and backwardly compatible. If OTF is employed, older "E" screens will convey the info as slightly diffused.

- Warning in the viewfinder when multiple exposure lever is engaged.
- Mirror lock-up.
- Recessed shutter speed dial; eliminates accidental speed changes; also "B" (bulb) setting on the shutter speed dial.
- OTF-TTL flash capable. This requires a SCA386 adapter for connecting several Mets electronic flashes and in some cases also a SCA300E adapter.
- Attachment ports for the magazines enlarged and beveled on the body, to allow for easier back installation.
- Interior of body coated with a sound and light deadening material; removes internal reflection, and makes the camera quieter.
- Lens release relocated to front of body.
- Rubber grips added to the sides of lower body, for easier grasping.

The backs have a locking dark slide, designated by a grey handle. The film advance grasp on the insert changed to a folding crank. The pressure roller tension was increased for film flatness improvement. The body/back F-Release pin housing returned to a substantial metal collar. Internally, the counter mechanism and gears were revised for greater reliability with the other models but when used in the ETRSi. the light from the LED's will be  diffuse

This is the latest and the last camera made by (Tamron) Bronica due to the increased sales of digital cameras sales of analogue cameras has dropped dramatically. On the Tamron side there is an overview of dates of discontinued models. Only a few photographers and photo enthusiasts still stay with analog photography but also here the number is decreasing. For the die hard this is an great opportunity to buy an medium format outfit for as very small part of the actual cost.


Zenza Bronica ERTSi Specifications
Type 4.5x6cm format lens shutter single lens reflex camera, w/interchangeable lens, film back, finder and focusing screen systems.
Frame Size 42.5x55.1mm (side/length ratio of 1:1.29 closely matches standard paper and reproduction sizes)
Film 120 roll film (15 exposures); 220 roll film (30 exposures); 135 cartridge-loaded film; and Polaroid Land pack film. (Exclusive film backs for each film type.)
Standard Lens Zenzanon-PE 75mm F/2.8 lens, interchangeable type; 6 elements in 5 groups; multi-layer anti-reflection coated; 49.7 angle of view; F22 minimum aperture; 60cm minimum focusing distance; and helical focusing.
Filter Size 62mm diameter for PE 40-250mm lenses, 95mm for EII 500mm lens and PE 100-220mm lens, 122mm for PE 500mm lens, and 32.5mm for PE 30mm lens fisheye.
Lens Mount Exclusive four claw Bronica ETR bayonet mount.
Lens Diaphragm Fully automatic instant reopening diaphragm action; equal-distance aperture scale graduations; depth of field previewing.
Shutter Electronic control SEIKO #0 between-lens leaf shutter; shutter speeds 8 to 1/500 sec. plus B (bulbs) and T (time); intermediate settings not possible; mechanical control setting of 1/500 sec.
Film Winding Film winding crank; one complete forward revolution or ratcheted winding action.
Mirror Lock Up Possible with mirror lock-up lever.
Multiple Exposure Possible with multiple exposure lever; red warning sign in finder.
Film Back Daylight loading interchangeable type; exclusive film backs for 120, 220 and 135 roll films and Polaroid Land pack film.
Finder System Interchangeable finder system; 94% of actual field of view (remains unchanged with different finders); choice of five optional finders, or Waist-Level Finder E, AE-III Prism Finder E, AE-II Finder E, Rotary Finder E and Prism Finder E.
Focusing Screen Interchangeable type; standard screen has matte spot.
Flash Synchronization X-setting (up to 1/500 sec.); auto-flash control based on direct light measurements at the film plane are possible with optional SCA System Adapter.
Battery Checking Red-colored LED lights up within screen area when battery check button is depressed, if there is sufficient power; also doubles as shutter closing signal.
Battery Single 6-volt silver oxide or alkaline-manganese battery; also powers AE-II Prism Finder E and AE-III Prism Finder E, when attached.
Dimensions 92(W) x 87(H) x 69(L)mm (ETRSi main body only), 92(W) x 107(H) x 165(L)mm (with standard lens, Film Back Ei 120 and Waist-Level Finder E)
Weight 480 grams (ETR-Si main body only; without battery) 1,285 grams (with standard lens, Film Back Ei 120 and Waist-Level Finder E; without battery.)


Zenza Bronica uses Zenzanon PE lenses, based on the original design technology of the Zenzanon-PG lenses and the Zenzanon-PS lenses of the SQ-Ai, which are already noted as being among the sharpest in the world.

The Zenzanon-PE lenses also take full advantage of the MTF (Modulation Transfer Function) technology in their design and have overall improvement in optical performance, such as resolving power, contrast etc. (by Bronica).

In total, there are 14 Zenzanon-PE lenses made for the ETR-Si there are also the Zenzanon EII 500 mm and the PE 1.4 en PE 2 converters. More detailed information about the PE lenses can be found in the lens table on this site,


There is complete finder interchangeability to match requirements for a wide range of image expressions, such as waist-level or eye-level view focusing, including low angle shots. And, the eye-level view-focusing AE - III Prism finder E makes possible TTL - metered aperture priority AE shots with a choice of spot metering or average metering, thus making possible very faithful presentations as well as increasing the handling ease of the ETR-Si. The AE viewfinders are powered by the internal battery of the ETR-Si. So not switching off the viewfinder after use will drain the battery completely in a short time.

The rotary viewfinder is an ideal tool for making portrait size pictures.

Waist level finder     Rotary finder


The difference between the AEII and the AE III is that the AE III beside AE with aperture priority also has the spot meter function and has a adjustable eye-piece system with step less adjustment from -2.5 to +0.5 diopter. The AE III has a LCD read-out display.

The focusing screen can be replaced by a screen that suits the photographer the most for the current job. * screens are available and can be interchanged on the basis of the lens, film back or picture taking conditions. When cleaning the Focusing screen be careful because the surface of the screens can easily be damaged.

The screen has a little clear window on the left side for the exposure and OTF led's. When an another type of screen is used not being an ETRSi screen, this is no problem but the light from the LED's will be diffused.
The 135 screen has some frame lines for use with 135-N or 135-W film back.

To remove the screen, shift the little silver lug to the right to unlock the screen. Then by using the fingernail or a tool, lift the screen with the little metal tip.



The ETRSi has different film backs, for the 4.6 x 6, 135-N; 24 x 36, 135-W 24 x 54 and the Polaroid back.

The film back EI is the standard film back for the ETRSi. the frame size is 4.5 x 6 cm with an exact image size of 42.5 x 55.1 mm. There are different backs available for 120 and 220 films. Some type of film backs have a little plastic guide tube for the exposure pin. Be careful not to damage this guide tube.

A Polaroid back is available for use with the ETRSi but merely for testing the scene or to determine the exposure than for actually taking pictures this because of the poor quality of the picture in most cases.

Also 2 135 film backs are available. These backs accept standard 135 film cartridges making it possible to use 135 film on the ETRSi. The 135-N has the standard Leica frame format from 24 x 36 mm and the 135-W has a panoramic size from 24 x 54 mm.



The film backs have a number of controls in the form of a small pin. The pin close to the transport gear is activated by the camera during the exposure to enable the film transport for the next exposure. The pin close to the dark slide tells the camera the dark slide is in or not. Newer film backs for the ETRSi as have a small slit in the dark slide and an small lever in the film back to lock the dark slide in the film back as long as the back is not mounted on a camera.

The ETRSi also has a lever to enable multi exposure on the same film. The lever moves the transport gear inside the camera so using the film transport handle only the mirror will be returned and the shutter will be cocked.


Some Bronica camera's are equipped with TTL measurement (Trough The Lens) for flash. This actually a OTF ( off the film plane) measurement because the light reflected by the film is measured. Only the camera's with an i version; the ETRSI and the SQ-Ai are equipped with this sensor.

The camera has a small connector on the left side to connect the SCA386 adapter to the camera.

The CCC (Current Control Center) system controls the auto-flash function. A small green LED visible in the focusing screen close to the red power control LED tells the photographer if the flash is ready or not..

A number of flash units are available for the Bronica camera's most widely used are flash guns from Metz. The flash needs to be compatible by option or can be mounted on the G15 grip. Some other flash units require also the a SCA300E adapter

The SCA386 adapter made by Bronica special for Metz flash units

Metz G15 Power Grip
  Left, The OTF sensor in the body of the ETRSi camera

There is a difference between TTL and OTF metering. With TTL the object is measured by a sensor inside the camera and by the values measured the exposure of the film is calculated and controlled. OTF measurement however measure the reflected light of the film plane. Depending of the varying properties of the film itself (color of the surface, reflecting properties) there will be a difference in metering. Some manufacturers of films supply information about this matter but the best way is to shoot one or more test films. With changing the ISO setting on the SCA 386 adapter influence can be obtained on the exposure of the film.

 (Manual G15 downloaden)
Overview of Metz flash units compatible for the ETRSi / SQ-Ai
Met SCA 386 adapter EN SCA 300 E adapter
28 CT-5, 30 TTL-1(i), 32 CT-2, 32 CT-3(i), 32 CT-7, 36 CT-2, 36 CT-3, 32 Z-2, 32 MZ-3, 40 MZ-1,40 MZ-2, 40 MZ-3, 50 MZ-5, 40 MZ1i, 40 MZ-3i
Met SCA 386 adapter EN PowerGrip G15
28 CT-5, 30 TTL-1(i), 32 CT-3(i), 32 CT-7, 36 CT-3
Met SCA 386 adapter
32 CT-4, 32 CT-8, 45 CT-3, 45 CL-3, 45 CT-4 ( na ser.nr 205180), 45 CL-4, 60 CT-4
Important: Information is retrieved from Metz documentation. Myphotoweb is not responsible for any inconsistencies and should not be held liable. Always check the manufacturer manuals.