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Bronica GS-1 150mm f/4 Zenzanon-PG Lens

The Bronica 150mm f/4 is a 150mm f/4 lens designed for Bronica GS mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Bronica GS-1 150mm f/4 Zenzanon-PG Lens

Bronica GS-1 150mm f/4 Zenzanon-PG Lens

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Lens Overview — Bronica 150mm f/4

The Bronica 150mm f/4 Zenzanon-PG is a manual focus prime lens built specifically for the Bronica GS medium format camera system. As a telephoto prime in the medium format category, it occupies a focal length well-suited to portrait and detail-oriented work, offering photographers a fixed 150mm perspective with a maximum aperture of f/4. The lens accepts 77mm screw-in filters, a generously sized front thread that accommodates a wide range of filter accessories.

At 850g, the Zenzanon-PG has a substantial, confidence-inspiring weight consistent with its medium format heritage and build quality expectations. The Bronica GS mount is a dedicated bayonet interface designed exclusively for the GS-1 system, meaning compatibility is specific and straightforward — this lens is built for one system and does that job with purpose. There is no autofocus here; this is a fully manual focus lens, which suits the deliberate, methodical shooting style that medium format photography naturally encourages.

With no image stabilization on board, the lens relies entirely on technique and support equipment for sharp results. For photographers already invested in the Bronica GS-1 system, the 150mm Zenzanon-PG represents a purpose-built telephoto prime option in a mount that sees limited modern lens offerings.

Key Features — Bronica 150mm f/4

150mm Medium Format Prime: A fixed telephoto focal length equivalent to roughly 75mm in 35mm terms, well-suited for portraits and detail work on the 6x7cm GS-1 system.

Bronica GS Mount: Dedicated bayonet mount designed exclusively for the Bronica GS-1, ensuring native compatibility without adapters or compromises.

f/4 Maximum Aperture: Provides usable light gathering for a medium format telephoto prime, with sufficient depth-of-field control for subject isolation.

Manual Focus Design: Fully manual focus operation suits the methodical, deliberate shooting style that medium format photography naturally encourages.

77mm Filter Thread: Generously sized front thread accommodates a wide range of commonly available screw-in filters including polarizers and ND filters.

850g Solid Construction: Substantial weight reflects the robust build quality consistent with Bronica's medium format lens heritage.

Lens Specifications — Bronica 150mm f/4

Bronica 150mm f/4 full specifications
SpecDetail
Use CasesPortrait, Studio, Product
Lens TypePrime
FormatMedium Format
Zoom/PrimePrime
Focal Length150mm
Maximum Aperturef/4
Camera SystemMedium Format
Lens MountBronica GS
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread77mm

Description — Bronica 150mm f/4

The Bronica 150mm f/4 Zenzanon-PG is a manual focus prime lens purpose-built for the Bronica GS medium format system. Operating at a fixed 150mm focal length, it falls into telephoto prime territory and is designed to complement the GS-1 body with a native Bronica GS mount connection. The maximum aperture of f/4 provides a workable exposure envelope for controlled shooting conditions.

Weighing 850g, the lens has the solid, reassuring heft characteristic of medium format glass. A 77mm filter thread makes it easy to pair with standard filter systems for creative or protective use. There is no image stabilization and no autofocus — this is a fully manual, optically dedicated lens that rewards photographers who prefer hands-on control.

For GS-1 system users looking for a telephoto prime, the Zenzanon-PG 150mm is a straightforward, system-native choice.

Pros — Bronica 150mm f/4

  • ✓Fixed 150mm focal length provides a dedicated telephoto perspective on the Bronica GS medium format system
  • ✓Maximum aperture of f/4 offers usable light gathering for a medium format telephoto prime
  • ✓Large 77mm filter thread accommodates a wide range of commonly available filter accessories

Cons — Bronica 150mm f/4

  • ✗Manual focus only — no autofocus capability, which may slow down shooting in dynamic or fast-moving situations
  • ✗No image stabilization, requiring careful technique or stable support for sharp images
  • ✗At 850g, the lens adds significant weight to a medium format kit

Videos — Bronica 150mm f/4

Six Months with The Bronica GS-1 — My Go-To 6x7 Film Camera — Kyle McDougall

Resources & Downloads — Bronica 150mm f/4

Manuals & Guides

Frequently Asked Questions — Bronica 150mm f/4

What cameras is the Bronica 150mm f/4 Zenzanon-PG compatible with?+
This lens is built for the Bronica GS mount, making it natively compatible with the Bronica GS-1 medium format camera system. It is not designed for use on other mounts without third-party adaptation.
Does this lens support autofocus?+
No. The Zenzanon-PG 150mm is a manual focus lens only. Photographers will need to focus by hand, which is standard practice for lenses designed for the Bronica GS-1 system.
What filter size does the Bronica 150mm Zenzanon-PG use?+
The lens has a 77mm filter thread, which is a widely used size that makes finding compatible filters — including UV, polarizer, and ND options — straightforward and affordable.
How heavy is this lens?+
The Zenzanon-PG 150mm weighs 850g. This is worth factoring in when planning a hand-held or field shooting kit, as it adds meaningful mass to a medium format camera body.
Does this lens have image stabilization?+
No, the specifications confirm image stabilization is listed as None. Photographers should plan to use a tripod or other support equipment to minimize camera shake, particularly at slower shutter speeds.

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