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Mamiya RB67 180mm f/4.5 Sekor Lens

The Mamiya 180mm f/4.5 is a 180mm f/4.5 lens designed for Mamiya RB mount cameras. Used copies start from $129.2 on GearFocus, with buyer protection on every purchase.

Mamiya RB67 180mm f/4.5 Sekor Lens

Mamiya RB67 180mm f/4.5 Sekor Lens

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Mamiya RB67 180mm f4.5 Sekor C Lens RB-67

Condition: Good

Product Highlights

  • Medium telephoto lens for Mamiya RB67
  • Bright f/4.5 maximum aperture
  • Ideal for portrait and studio photography
  • Robust and durable construction

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Used Mamiya 180mm f/4.5 Listings on GearFocus

Mamiya RB67 180mm f4.5 Sekor C Lens RB-67
Mamiya RB67 180mm f4.5 Sekor C Lens RB-67

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$129.20

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Lens Overview — Mamiya 180mm f/4.5

The Mamiya 180mm f/4.5 Sekor is a manual focus prime lens built specifically for the Mamiya RB mount system, designed to work with medium format cameras in that ecosystem. With a focal length of 180mm and a maximum aperture of f/4.5, this telephoto prime sits comfortably in the medium format telephoto range, making it a considered choice for photographers who want a longer reach on the RB67 platform. Being a prime lens, it offers a fixed focal length of 180mm with no zoom capability, which encourages deliberate composition and typically rewards with consistent optical performance across the frame.

Focus is entirely manual, which suits the methodical shooting style that medium format photography naturally demands. The lens accepts 77mm filters, a generous thread size that reflects the optical elements needed to cover the medium format image circle. Weighing in at 1100g, it has a substantial, well-built feel that is characteristic of medium format glass from this era.

There is no image stabilization, which is expected for a manual focus medium format lens of this type. Overall, this Sekor lens represents a compelling option for photographers already invested in the Mamiya RB system who need a telephoto prime for their work.

Key Features — Mamiya 180mm f/4.5

180mm Medium Format Prime: Equivalent to roughly 90mm in 35mm terms on the RB67, making it well-suited for portraiture, detail shots, and compressed perspectives.

Mamiya RB Mount: Native mount compatibility ensures full mechanical integration with Mamiya RB67 and RB67 Pro-S cameras.

f/4.5 Maximum Aperture: Provides usable subject separation and light gathering for a telephoto lens covering the large 6x7 medium format image circle.

Manual Focus Design: Smooth focus ring suits the deliberate, tripod-based shooting workflow typical of medium format photography.

77mm Filter Thread: Accepts widely available 77mm filters, including ND, polarizer, and UV options, without the need for step-up rings.

Leaf Shutter Compatible: Designed to work with the RB67's rotating bellows system; the shutter resides in the lens itself, enabling full flash sync at all speeds.

Lens Specifications — Mamiya 180mm f/4.5

Mamiya 180mm f/4.5 full specifications
SpecDetail
Use CasesPortrait, Studio, Product
Lens TypePrime
FormatMedium Format
Zoom/PrimePrime
Focal Length180mm
Maximum Aperturef/4.5
Camera SystemMedium Format
Lens MountMamiya RB
AutofocusNo
Focus TypeManual Focus
Image StabilizationNone
Filter Thread77mm

Description — Mamiya 180mm f/4.5

The Mamiya 180mm f/4.5 Sekor is a prime lens designed exclusively for the Mamiya RB mount, covering the medium format camera system. With a fixed focal length of 180mm and a maximum aperture of f/4.5, it occupies the telephoto range and is suited to photographers who want greater reach within the RB67 system. Focus is manual only, fitting the deliberate and precise shooting workflow that medium format photography calls for.

The lens features a 77mm filter thread, providing compatibility with a broad selection of standard screw-in filters. At 1100g, it has the kind of solid, substantial build that comes with medium format glass of this caliber. There is no image stabilization, so a sturdy tripod or careful handheld technique is advisable.

For photographers already working within the Mamiya RB ecosystem, this 180mm Sekor prime offers a dedicated telephoto option at a fixed, consistent focal length.

Pros — Mamiya 180mm f/4.5

  • ✓Fixed 180mm focal length provides a dedicated telephoto perspective on the Mamiya RB system
  • ✓Maximum aperture of f/4.5 offers reasonable light-gathering capability for a medium format telephoto prime
  • ✓Large 77mm filter thread accommodates a wide range of standard filters

Cons — Mamiya 180mm f/4.5

  • ✗Substantial weight of 1100g may add considerable bulk to an already heavy medium format kit
  • ✗Manual focus only — no autofocus capability for any shooting scenario
  • ✗No image stabilization, requiring careful technique or support when shooting handheld

Resources & Downloads — Mamiya 180mm f/4.5

Manuals & Guides

Frequently Asked Questions — Mamiya 180mm f/4.5

Which camera systems is this lens compatible with?+
This lens is built for the Mamiya RB mount, making it natively compatible with Mamiya RB series medium format cameras. It is not directly compatible with other camera systems without a dedicated mount adapter.
Does this lens support autofocus?+
No, this lens is manual focus only. Photographers must focus manually, which is consistent with the design philosophy of the Mamiya RB system.
What filter size does this lens use?+
The lens has a 77mm filter thread, allowing the use of standard 77mm screw-in filters for creative or protective purposes.
How heavy is this lens?+
The lens weighs 1100g. This is worth factoring in when building a kit around the Mamiya RB system, as the camera body itself is also substantial.
Does this lens have image stabilization?+
No, there is no image stabilization on this lens. Photographers should plan accordingly, using a tripod or other support when shooting in situations where camera shake could be a concern.
Is this a zoom or prime lens?+
This is a prime lens with a fixed focal length of 180mm. It does not zoom and is designed to be used at that single focal length.

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