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Mamiya RB67 150mm f/4 Soft Focus C Lens

The Mamiya 150mm f/4 Soft Focus C is a 150mm f/4 lens designed for Mamiya RB mount cameras. Used copies start from $168.3 on GearFocus, with buyer protection on every purchase.

Mamiya RB67 150mm f/4 Soft Focus C Lens

Mamiya RB67 150mm f/4 Soft Focus C Lens

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Mamiya 150mm f/4 Soft Focus C — image 1
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Mamiya RB67 150mm f4 Soft Focus C Lens, NO Discs

Condition: Good

Product Highlights

  • Soft focus lens for creative photography
  • Compatible with Mamiya RB67 system
  • Adjustable soft focus control
  • Medium format lens design

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Used Mamiya 150mm f/4 Soft Focus C Listings on GearFocus

Mamiya RB67 150mm f4 Soft Focus C Lens, NO Discs
Mamiya RB67 150mm f4 Soft Focus C Lens, NO Discs

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$168.30

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Lens Overview — Mamiya 150mm f/4 Soft Focus C

The Mamiya 150mm f/4 Soft Focus C Lens is a manual focus prime built specifically for the Mamiya RB mount system, targeting medium format photographers who want deliberate creative control over their images. Classified as a Special Effect lens in the medium format category, it sits in the standard focal length range at 150mm — a natural choice for portrait and editorial work on the RB67 platform. With a maximum aperture of f/4, the lens offers a workable starting point for soft focus rendering without sacrificing too much light-gathering ability.

The manual focus-only design is entirely consistent with the RB67 system's deliberate, studio-oriented shooting style, encouraging a methodical approach to composition and focus. Weighing 850g, it's a substantial piece of glass that reflects the build quality expectations of medium format equipment from this era. The 77mm filter thread is a practical advantage, allowing the use of widely available filtration.

For photographers working within the Mamiya RB ecosystem who want a purpose-built soft focus option rather than relying on post-processing, this lens offers a direct, optical solution with the authenticity that only in-camera rendering provides.

Key Features — Mamiya 150mm f/4 Soft Focus C

Optical Soft Focus Design: Produces soft focus rendering in-camera through optical means, rather than relying on post-processing filters or diffusion attachments.

Adjustable Soft Focus Effect: Features a dedicated soft focus control ring that lets photographers dial in the degree of diffusion independently of the aperture setting.

150mm Prime Focal Length: A standard medium format focal length well-suited to portrait and editorial work at natural shooting distances on the RB67.

Mamiya RB Mount: Native RB mount compatibility ensures full mechanical integration with the Mamiya RB67 system, including the rotating back.

f/4 Maximum Aperture: Provides usable light transmission for a specialized soft focus lens, supporting studio and controlled-lighting environments.

Manual Focus Only: Fully manual focus operation suits the deliberate, tripod-based shooting style typical of RB67 studio work.

Lens Specifications — Mamiya 150mm f/4 Soft Focus C

Mamiya 150mm f/4 Soft Focus C full specifications
SpecDetail
Use CasesPortrait, Creative Effects, Studio
Lens TypeSpecial Effect
FormatMedium Format
Zoom/PrimePrime
Focal Length150mm
Maximum Aperturef/4
Camera SystemMedium Format
Lens MountMamiya RB
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread77mm

Description — Mamiya 150mm f/4 Soft Focus C

The Mamiya 150mm f/4 Soft Focus C Lens is a Special Effect prime designed exclusively for the Mamiya RB mount, making it a native fit for the RB67 system. With a fixed focal length of 150mm and a maximum aperture of f/4, it occupies the standard focal length range in medium format terms — a range frequently favored for portrait and creative editorial work. The lens is manual focus only, which suits the measured, tripod-based shooting style the RB67 system is known for.

Its 77mm filter thread offers broad compatibility with widely available circular filters. Tipping the scales at 850g, this is a substantial lens befitting the medium format category. As a purpose-built Special Effect lens within the medium format ecosystem, it provides an optical approach to soft focus rendering that is distinct from post-processing techniques — delivering results at the moment of capture rather than in editing.

For RB67 users seeking creative differentiation in their work, this lens represents a dedicated, in-camera tool for that aesthetic.

Pros — Mamiya 150mm f/4 Soft Focus C

  • ✓Purpose-built for the Mamiya RB mount — guaranteed native compatibility with the RB67 system
  • ✓150mm focal length sits in the standard range for medium format, well-suited to portrait-distance work
  • ✓Maximum aperture of f/4 provides usable light transmission for a specialized soft focus design

Cons — Mamiya 150mm f/4 Soft Focus C

  • ✗No autofocus capability — manual focus only, which may slow shooting pace in fast-moving situations
  • ✗At 850g, this is a hefty lens that adds considerable weight to an already substantial camera system
  • ✗No image stabilization, though this is standard for manual medium format glass

Videos — Mamiya 150mm f/4 Soft Focus C

THE BEST MAMIYA RB67 LENS!!! — Brooks Witta

Resources & Downloads — Mamiya 150mm f/4 Soft Focus C

Manuals & Guides

Frequently Asked Questions — Mamiya 150mm f/4 Soft Focus C

Which cameras is this lens compatible with?+
This lens is built for the Mamiya RB mount, making it compatible with Mamiya RB67 cameras. No additional mount compatibility is listed in the specifications.
Does this lens support autofocus?+
No — this is a manual focus-only lens. This is consistent with the Mamiya RB67 system's design philosophy and the deliberate pace of medium format studio shooting.
What filter size does this lens accept?+
The lens has a 77mm filter thread, which is a common size that gives you access to a broad selection of filters from many manufacturers.
How heavy is this lens?+
The lens weighs 850g. Buyers should factor this into their kit weight, particularly when using it handheld with the already substantial RB67 body.
Is this a zoom or a prime lens?+
This is a prime lens with a fixed focal length of 150mm. It falls within the standard focal length range for medium format and does not zoom.
Does this lens have image stabilization?+
No, this lens has no image stabilization. Photographers should plan accordingly, particularly when shooting in lower light conditions.

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