ETR Introduced January, 1976

Mid seventies, Bronica planned a complete new product line for the medium format cameras, divided into 3 image formats, 4.5 x 5, 6 x 6 and 6 x 7 3 different cameras to replace the older S2A. The ETR for 4.5 x 6, the SQ for the square 6 x 6 and de GS-1 for the 6 x7 format. All three camera types are using lenses with leaf shutter build between the lens to replace the focal plane shutters. For these lenses  the electronically controlled Seiko #0 shutter are selected, with a minimum exposure time of 1/500 sec. Flash is possible with all exposure times. All cameras should be very modular so the photographer can select the correct outfit belonging to the job.

The Bronica ETR camera was introduced in January, 1976. It was the first of Bronica's leaf shuttered series, and its basic design and operating system was the foundation for all current Bronica cameras. So far ahead of its time was the engineering of this camera, that after more than 20 years, it remains the most advanced professional medium format system available today, while retaining the hallmarks of simplicity and practicality. At introduction, the ETR was mend to be a direct competitor for the Mamiya M645.

The ETR type camera has undergone several changes since the first model, most of them resulting in a change of model name. What follows is a listing of the changes, and the compatibility between accessories and the evolving bodies.

The ETR type camera has undergone several changes since the first model, most of them resulting in a change of model name. What follows is a listing of the changes, and the compatibility between accessories and the evolving bodies.

DESCRIPTION: Modular 6x4.5cm camera system; full sync shutter lenses; 120/220 interchangeable film magazines, inserts, Polaroid; Interchangeable finders, auto/manual metering capability. Patented Speed Grip allows for "35mm" style handling, with winding, firing, grasping, and hot shoe all on the grip.

The Bronica ETR was introduced in January, 1976. It was the first of a series of Bronica camera's with a leaf shutter instead of a focal plane shutter. The technical design and the easy way of using the camera was the basis for all current Bronica camera's and was way ahead of time. After more than 20 years it was the most advanced professional medium format camera available and very easy to use.

The ETR is a modular 4.5 x 6 camera system en was mend as a starting model for the medium format film. It is a so called SLR camera system (single Lens Reflex) with interchangeable lenses, film backs, focusing screens and finders and was it direct opponent for the very popular Mamiya M645 camera. In may tests from Photo magazines, the ETR was very often compared to the M645.

With the interchangeable lenses, film backs, focusing screens and several finders is it clear that the ETR is a universal system camera for the professional and the advanced amateur photographer. At the start the camera was supplied in the chrome version and the black version was an option. The black version was very popular so Bronica decided to make this the standard version and ended the production of the chrome version.

The camera is equipped with a electronically controlled between the lens leaf shutter with exposure times from 8 sec. up to 1/500 sec. in steps of 8, 4, 2, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1.250 en 1/500. sec Also there is  the B (bulk) setting. The power for the electronic is a 6 volt V28PXL Lithium battery accessible trough the bottom of the camera. Without battery or with a dead battery the exposure time of 1/500 sec is always possible because this is an mechanical controlled time.




A number of lenses are available for the ETR the 40mm F:4 wide angle, a 35 mm equivalent van 25 mm, the 50 F:2.8  eqv. 30 mm de 75mm F:2.8 standard lens eqv. 46 mm, portrait lens 150 F:4 eqv. 90 mm en and the tele 250 mm F:5.6 eqv. 150 mm.

Film backs;
The film size used by the ETR is 4.5 cm x 6 cm on 120 film with a exact image size of 42.5 mm x 55.1 mm. The number of exposures of a 120 film back is 15 and for a 220 film back it is 30 exp. The film backs are of the daylight type witch means they can be interchanged and or filled without the need of a darkroom. There is also a Polaroid back for use of instant films and a 70 mm film back for 50 exposure roll film.


A number of interchangeable finders are available. First of all the waist-level finder with a built in magnifying glass. A advantage of the waist-level finder is that the photographer has a very good overview of the composition of the planned exposure. The built in magnifying glass can easily brought up by just shifting the lever on the finder. the standard diopter value is -1.5 but can be interchanged with diopter of +1.5, +0.5, -0.5,-2.5, -3.5 and -4.5.

By pressing the finder release button on the right top side of the camera, the finder can be removed and replaces by any other of the available finders like the AE finder, the prism finder or the rotary finder.


A very useful piece of accessory is the speed grip. The grip is put in place by first removing the standard transport handle. Pull the pin keeping the handle in place and remove the handle after this, replace the pin and shift the speed grip over the bottom plate until the remove lock is in place then tighten the fixing lock. The transport fork should correctly interface with the interlock pin. The film is advanced by pressing 2 times the transport handle. At the beginning also the "L" and the "T" grip were available but the production of these has been discontinued in 1979.

Focusing screens;
Interchangeable focusing screens are an aid for the photographer and give him the freedom to see the image trough the finder as he likes it to be. Wit a focusing screen with micro prism it is very easy to correctly and precisely focus the image. The interchangeable focusing screens are a part of the system to make the camera very modular.

Other accessories are the automatic bellows, automatic extension tubes, motor drive and sport finder. The sport finder was also available for the S2A.

Bronica was the first camera manufacturer who was in contact with  "Optische Werken Schneider" in Germany to produce a tilt and shift lens for the Bronica camera's; the super-angulon PCS 4.5 / 55 mm. The lens with a leave shutter was really a sensation and was a subject for many articles in several Photo magazines. The lens was equipped for an open aperture measurement with a AE finder. It was also the first T&S lens with a very respectable horizontal movement of 12 mm from left to right and also 12 up and down with a wide angle view equal to a 33 mm lens for 135 film


Specifications van de Zenza Bronica ETR


4.5 cm x 6 cm format lens shutter single lens reflex camera, with interchangeable lens, film back, finder and focusing screen systems.

Frame size

42.5 mm x 55.1 mm (side/length ratio of 1:1.29 closely matches standard paper and reproduction sizes


120 roll film (15 exposures)

Standard lens

Zenzanon E 75mm F2.8 lens; interchangeable type; 5 elements in 4 groups; multi-layer anti-reflection coated; 50 angle of view, F22 minimum aperture, helical focusing from inf. to 60 cm.

Filter size

58 mm diameter screw mount on 75 mm lens; 62 mm diameter screw mount on lenses from 40 mm to 250 mm focal lengths

Lens mount

Exclusive four claw Bronica bayonet mount

Lens diaphragm

Fully automatic instant reopening lens diaphragm action; equal-distant aperture scale graduations; depth of field previewing


Electronic control SEIKO #0 between-lens leaf shutter; shutter speeds 8 sec. to 1/500 sec plus T (time exposures); mechanical control setting 1/500 sec

Multiple exposure

Multiple exposure possible with lever on body

Film back

Daylight loading interchangeable type, exclusive backs foe 120(15 exposures) and 220 (30 exposures) roll films, 70mm (90 exposures) film and Polaroid film pack. Supplied with 120 roll film back.)


Interchangeable waist-level focusing hood ; single action opening/closing; flip-up interchangeable type magnifier (standard magnifier -- 1.5 diopter); finder magnification with 75 mm lens 1.25x

Focusing screen

Interchangeable type; standard type has split-image spot surrounded by micro prism ring; matte center with full area fresnel lens type also available

Accessory mount

Exclusive Bronica accessory mount on left side of the body

Flash Synchronization

X-setting (up to 1/500 sec)

Battery checking

Battery check button plus green-colored LED light on top of body


Single-6-volt silver oxide battery (Eveready No. 544, UCAR No. 544 or Mallory N0. PX-28).


110 mm (4-1/2") wide x 106 mm (4-1/4") high x 157 mm (6-1/4") long (with standard lens and waist-level finder)


1,346 grams (2.9lbs) ETR camera with waist level finder and 75 mm F2.8 lens
493 grams (1lb) ETR Body only (with battery)
326 grams (11,4 oz) 120 roll film back only
417 grams (14.6 oz) 75 mm F2.8 lens only
110 grams (3.8 oz) Waist level finder only


ETRC Introduced October 1977

Released in October 1977 and is a modern successor of the Bronica 'C'. The camera has no separate interchangeable film backs but an integrated film chamber accepting film inserts. This camera is mend for those photographers without a need for Polaroid back or interchangeable film back. Furthermore the ETRC is equal to the ETR.

At the same time the ETRC is released, also a number of lenses are available, besides the classical F=75 / 2.8, a F=40 / 4 wide angle, a F=50 / 2.8 lens en de tele lenses F=150 / 4 en F=250 / 5.6.