Bronica GS-1 Final2002

History

Bronica introduced the GS-1 in 1983 as its largest-format SLR, positioned to compete with the Mamiya RB67 and Pentax 6x7 in the 6x7 market and to extend Bronica's modular system philosophy into the "ideal format" negative size favoured by many commercial photographers. The GS designation marked a wholly separate mount and system from the ETR (645) and SQ (6x6) lines; GS-mount lenses and accessories are not interchangeable with those systems.

The GS-1 was never revised with a successor model the way the ETR line evolved through multiple iterations. It was produced with incremental refinements - notably the GS-1 Pro and W variants - but the core body design remained recognisably the same from 1983 through discontinuation. This longevity reflects both the stability of the 6x7 professional market and, latterly, Tamron's declining investment in Bronica development following the acquisition.

By 2002 the analogue professional market was in steep decline. Tamron announced the end of Bronica production in 2004. The GS-1 Final units were produced as the last of the GS line, with no announcement of a digital successor and no transfer of the GS mount to any other platform.

Why It Matters

The GS-1 Final is the last 6x7 SLR with a leaf-shutter lens system that any manufacturer produced for the mass professional market. Its peers - the Mamiya RB67 and Pentax 6x7/67 - use focal-plane shutters, which limit flash sync to relatively slow speeds. The GS-1's full-speed flash sync capability at 1/500s was a genuine differentiator in commercial studio and location work, and this advantage was unique among 6x7 systems.

For collectors the GS-1 Final marks a clear terminus: once these bodies were sold, no new production followed. The Bronica brand has not been revived. GS-mount lenses cannot be readily adapted to other systems.

For working photographers the GS-1 (Final or otherwise) remains a capable 6x7 tool. The 6x7 negative is the largest commonly available from a handheld system, delivering exceptional detail and tonal range when scanned or printed optically. The Zenzanon-GS lenses - particularly the 100mm f/3.5 and 65mm f/5.6 - are well-regarded optically.

Lenses & Accessories

The GS-1 accepts all Bronica GS-mount lenses. The GS system produced a smaller lens range than the ETR or SQ lines:

• Zenzanon-GS 50mm f/4.5 - ultra-wide
• Zenzanon-GS 65mm f/5.6 - wide angle
• Zenzanon-GS 100mm f/3.5 - standard normal lens; the most common kit lens
• Zenzanon-GS 150mm f/3.5 - portrait telephoto
• Zenzanon-GS 200mm f/4.5 - telephoto
• Zenzanon-GS 250mm f/6.3 - long telephoto
• Zenzanon-GS 110mm f/4 Macro - macro

System accessories:

• Film backs - 120 (10 exp), 220 (20 exp), Polaroid
• Viewfinders - waist-level finder (standard), metered prism, magnifying hood
• Motor drive - integral to body

Sample Photographers / Notable Use

• The GS-1 system was used in Japanese commercial, portrait, and fashion photography through the 1980s and 1990s, particularly where the flash-sync advantage of the leaf-shutter lenses was valued over the Mamiya RB67.
• The 6x7 format's near-ideal 5:4 aspect ratio (when cropped) made it popular for magazine editorial and advertising work requiring both full-frame and cropped compositions.

References

• Camera-Wiki: Bronica GS-1 - system history, specifications, and accessory overview