C41
Kodak Portra 400
Kodak Portra 400 is a professional C-41 color negative film known for flexible exposure latitude, natural skin tones, and fine grain.
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slr-medium-format
The Bronica GS-1 (1983) is a 6×7 medium-format SLR in Bronica's modular system. Like the SQ-Ai (6×6) and ETRSi (6×4.5), it has interchangeable backs, lenses, and finders. Electronic leaf shutter in each lens, AE coupling via prism finder, TTL flash. The body is significantly lighter than a Mamiya RB67 (1.9 kg loaded vs 2.7 kg) — the "GS" stood for "Graphic Studio," signaling a lighter studio body than the mainline competitors.
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Recommended film stocks for the — format your camera takes.
C41
Kodak Portra 400 is a professional C-41 color negative film known for flexible exposure latitude, natural skin tones, and fine grain.
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Kodak Portra 160 is a professional C-41 color negative film with fine grain, soft contrast, and natural color.
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Kodak Ektar 100 is a fine-grain C-41 color negative film with saturated color and high sharpness.
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Before you buy used
About this camera
Bronica's 6×7. Modular like the SQ-Ai, leaf-shuttered, hand-holdable for studio work — the under-the-radar alternative to the Mamiya RB67/RZ67.
| Field | Value |
|---|
| Format | 120 / 220, 6×7 cm (10 frames per 120 roll) |
| Mount | Bronica G |
| Years | 1983–2002 |
| Shutter | 8s – 1/500s, Seiko electronic leaf, in each lens |
| Flash sync | All speeds |
| Meter | None (body); via AE-G prism finder |
| Modes | Manual, aperture priority (AE prism) |
| Weight | 1,900 g (loaded) |
| Battery | 1× 6V (required) |
Released 1983 as Bronica's only 6×7 SLR. Production ran 19 years until 2002, when Bronica's mainline production ended ahead of Tamron's brand closure (2004). The Zenzanon-PG lens line was made specifically for the GS-1. Total volume was modest — the GS-1 never achieved Mamiya RB67/RZ67 market share.
The GS-1 occupies a niche between the Mamiya 7 (lightweight 6×7 rangefinder) and Mamiya RB67/RZ67 (heavy 6×7 SLR). It's the only leaf-shutter modular 6×7 SLR that's hand-holdable for portraits — the leaf shutter syncs at all speeds, the body is modular for back swaps mid-shoot, and the weight (under 2 kg) doesn't require constant tripod use.
For 2026 buyers, the GS-1 is one of the better deals in 6×7. A clean GS-1 + 100mm PG + 120 back + AE prism runs $700–1,100, dramatically below comparable Mamiya RZ67 setups. Trade-off: smaller lens system (only 7 PG lenses), less third-party support.
Zenzanon-PG lenses: 50/4.5 PG, 65/4.5 PG, 100/3.5 PG (kit), 110/4 PG Macro, 150/4 PG, 200/4.5 PG, 250/5.6 PG. Backs: 120, 220, 4.5×6 mask, Polaroid. Finders: waist-level (default), AE-G prism (TTL meter), magnifying chimney. Speed Grip-G, Motor Drive Wind Grip.
BW
Ilford HP5 Plus is a flexible ISO 400 black-and-white film with classic grain and strong push-processing tolerance.
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Kodak Tri-X 400 is a classic black-and-white film known for strong tonality, visible grain, and documentary character.
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