10th Anniversary 2012-2022
More than just a camera lens database

Bronica GS-1 system


The Bronica engineering group developed the GS-1 with the photographer in mind: 6x7 image with capabilities of 6x6, 6x4.5, and Polaroid interchangeable backs, leaf shutter lenses, for full flash synchronization at all shutter speeds, the most compact 6x7 SLR body.

Zenzanon PG interchangeable lenses ranging from 50mm to 500mm were developed specifically for the GS-1, employing computer-aided optical design and a multi-coating technology. Incorporating the compact Seiko #0 electronic lens shutter system, the camera was made smaller and optical performance upgraded. Shutter speeds were available from 1/500th of a second to 16 seconds. The Zenzanon PG series also included tele-converters that extended the focal length of lenses from 50mm to 500mm - either 1.4 or 2 times. In addition, a bellows attachment, extension tubes, close-up lenses and a professional lens hood were also available.

Camera lineup

Bronica GS-1 mount lens lineup

Wide-angle prime lenses
4.5 Zenza Bronica Zenzanon-PG 50mm F/4.5 [GS-1] ⌀95Pro 1983 
4.0 Zenza Bronica Zenzanon-PG 65mm F/4 [GS-1] ⌀72Pro 1983 
3.5 Zenza Bronica Zenzanon-PG 80mm F/3.5 [GS-1] ⌀72Pro 1997 
Standard prime lenses
3.5 Zenza Bronica Zenzanon-PG 100mm F/3.5 [GS-1] ⌀72Pro 1983 
Short telephoto prime lenses
4.0 Zenza Bronica Zenzanon-PG 150mm F/4 [GS-1] ⌀72Pro 1983 
4.5 Zenza Bronica Zenzanon-PG 200mm F/4.5 [GS-1] ⌀82Pro 1984 
5.6 Zenza Bronica Zenzanon-PG 250mm F/5.6 [GS-1] ⌀82Pro 1983 
Medium telephoto prime lenses
8 Zenza Bronica Zenzanon-PG 500mm F/8 [GS-1] ⌀122Pro 1983 
Macro lenses
4.0 Zenza Bronica Macro Zenzanon-PG 110mm F/4 [GS-1] ⌀721:4 @ CFD 0.66mPro 1984 
Completeness of lens lineup
    Enthusiast photography
    Professional photography

    No dedicated lenses for architectural photography with perspective correction, professional macrophotography.

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