Produced between 1976-1983.
The ETRS is an improved version of the ETR. The main improvement is the interchangeable viewfinder system. The newer AE II and III finders are not fully compatible with the older ETR cameras, because there is a new electronic connector pin. The shutter button lock has been redesigned. It has three settings, unlocked, shutter release button lock but drive and cable release unlocked, and all locked. The neck strap mount has been changed to a design with an eyelet while the previous one was a spring catch style mount used on the Bronica 6×6’s, along with many Hasselblad’s and Kievs .
Type: 4.5 x 6cm format lens shutter single lens reflex camera with interchangeable lens, film back , finder and focusing screens system.
Frame size: 42.5mm x 55.1mm (side/length ratio of 1:1,29 closely matches standard paper and reproduction sizes)
Film : 120 roll film ( 15 exposures).
Standard lens : Zenzanon E75mm F2.8 lens; interchangeable type; 5 elements in 4 groups; multi-layer anti-reflection coated; 50⁰ angle of view, F22 minimum aperture , helical focusing from inf, to 60cm.
Filter size : 58mm diameter screw mount on 75mm lens; 62mm diameter screw mount on lenses from 40mmto 250mm 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.
Shutter : Electronic control SEILO #0 between-lens leaf shutter; shutter speeds 8 seconds to 1/500 second . plus T (time exposures) ; mechanical control setting 1/500 sec.
Multiple exposure : Multiple exposures possible with lever on body.
Film back : Daylight loading interchangeable type , exclusive backs for 120 ( 15 exposures) and 220 ( 30 exposures) roll films, 70mm (90 exposures) film and Polaroid film pack. (Supplied with 120 roll film back)
Finder system: Interchangeable finder system , with choice of four optional finders, waist level finder, AE (automatic exposure) finder, rotary viewfinder and prism finder. No standard finder is supplied and therefore a suitable one must be ordered separately.
Focusing screen : Interchangeable type ; standard type has split-image rangefinder 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 body .
Flash synchronization : X-setting ( up to 1/500 sec)
Battery checking : Battery check button plus green-colored LEDF light on top of body.
Battery : Single 6 volt silver oxide battery . Mallory No. PX-28
Dimensions: 110mm x 106mm x 157mm.
Weight : Body only 493 grams
120 roll film back only 326 grams.
75mm F2.8 lens 417 grams.
Waist level finder 110 grams.