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Bronica SQ 40mm f/4 Zenzanon-S Lens

The Bronica 40mm f/4 is a 40mm f/4 lens designed for Bronica SQ mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Bronica SQ 40mm f/4 Zenzanon-S Lens

Bronica SQ 40mm f/4 Zenzanon-S Lens

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Lens Overview — Bronica 40mm f/4

The Bronica SQ 40mm f/4 Zenzanon-S is a wide-angle prime lens built specifically for the Bronica SQ medium format camera system. With a fixed focal length of 40mm and a maximum aperture of f/4, this lens is designed to deliver the optical character that medium format shooters expect from the Zenzanon-S lineup. As a manual focus lens, it puts full control in the hands of the photographer, making it well suited to deliberate, considered shooting styles common in medium format work.

The lens accepts filters via its 95mm front filter thread, accommodating large-diameter circular and screw-in filters appropriate for a medium format optic of this size. Weighing 600g, the lens has a solid, substantial feel consistent with its medium format build quality. With no image stabilization, the lens relies entirely on the shooter's technique or a stable support system, which is standard practice for medium format prime lenses of this era.

Compatibility is exclusive to the Bronica SQ mount, making it a dedicated tool for photographers already invested in that system. It is categorized as a wide-angle lens, with both its minimum and maximum focal length sitting at 40mm.

Key Features — Bronica 40mm f/4

40mm Medium Format Prime: Equivalent to roughly 22mm in 35mm terms on the 6x6 SQ system, delivering a genuinely wide field of view for landscapes, architecture, and environmental work.

Bronica SQ Mount: Designed exclusively for the Bronica SQ system, ensuring full mechanical and optical compatibility with SQ, SQ-A, SQ-Ai, and SQ-B bodies.

f/4 Maximum Aperture: A usable maximum aperture for a medium format wide-angle prime, suitable for controlled lighting situations and tripod-based shooting.

Manual Focus Design: Puts full focus control in the photographer's hands, well suited to the deliberate, measured pace typical of medium format shooting.

95mm Filter Thread: Large-diameter front thread accommodates screw-in filters sized appropriately for a wide medium format optic, including polarizers and ND filters.

Zenzanon-S Optics: Part of Bronica's dedicated SQ lens lineup, the Zenzanon-S series was built to meet the resolving power demands of 6x6 medium format film.

Lens Specifications — Bronica 40mm f/4

Bronica 40mm f/4 full specifications
SpecDetail
Use CasesLandscape, Architecture, Studio
Lens TypeWide-Angle
FormatMedium Format
Zoom/PrimePrime
Focal Length40mm
Maximum Aperturef/4
Camera SystemMedium Format
Lens MountBronica SQ
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread95mm

Description — Bronica 40mm f/4

The Bronica SQ 40mm f/4 Zenzanon-S is a prime wide-angle lens built for the Bronica SQ medium format camera system. With a fixed 40mm focal length and a maximum aperture of f/4, it is a purposeful tool for photographers working in the medium format space who need a wide-angle option within the Zenzanon-S family. The lens is manual focus only, placing full creative control with the operator and making it well suited to methodical, deliberate shooting.

A 95mm filter thread allows for the use of large-format screw-in filters, while the lens's 600g weight gives it a reassuringly solid presence. There is no image stabilization, consistent with the manual, tripod-friendly workflows common to medium format photography. Exclusively compatible with the Bronica SQ mount, this lens is a natural choice for photographers already shooting within the Bronica SQ ecosystem who want to expand into wide-angle territory.

Pros — Bronica 40mm f/4

  • ✓Fixed 40mm focal length offers a dedicated wide-angle perspective on the Bronica SQ medium format system
  • ✓Maximum aperture of f/4 provides usable light-gathering for a medium format wide-angle prime
  • ✓Large 95mm filter thread accommodates a wide range of screw-in filters

Cons — Bronica 40mm f/4

  • ✗No image stabilization, requiring careful technique or a tripod for sharp results
  • ✗Manual focus only — no autofocus option for faster or more reactive shooting
  • ✗Exclusive Bronica SQ mount limits use to that specific camera system with no cross-system flexibility

Videos — Bronica 40mm f/4

Bronica ETRSi Review — Compact 645 Medium Format — Kyle McDougall

Resources & Downloads — Bronica 40mm f/4

Manuals & Guides

Frequently Asked Questions — Bronica 40mm f/4

What camera system is this lens compatible with?+
The Bronica SQ 40mm f/4 Zenzanon-S is designed exclusively for the Bronica SQ mount. It is not compatible with other medium format or 35mm camera systems without an adapter.
Does this lens support autofocus?+
No, this lens is manual focus only. Photographers must set focus by hand, which is standard for lenses designed for the Bronica SQ system.
What filter size does this lens use?+
The lens has a 95mm front filter thread. This is a large diameter, so be sure to source filters specifically sized at 95mm.
How heavy is the Bronica SQ 40mm f/4 Zenzanon-S?+
The lens weighs 600g. This is a solid, substantial weight typical of medium format optics and should be factored in when selecting a camera support or bag.
Does this lens have image stabilization?+
No, the lens has no image stabilization. Users should plan for steady hand-holding technique or use a tripod, particularly at slower shutter speeds.

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