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Phase One Mamiya AF 28mm f/4.5 Aspherical Lens

The Phase One 28mm f/4.5 Aspherical is a 28mm f/4.5 lens designed for Mamiya 645 mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

Phase One Mamiya AF 28mm f/4.5 Aspherical Lens

Phase One Mamiya AF 28mm f/4.5 Aspherical Lens

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Lens Overview — Phase One 28mm f/4.5 Aspherical

The Phase One Mamiya AF 28mm f/4.5 is a prime wide-angle lens built specifically for the medium format system, mounting via the Mamiya 645 lens mount. Designed to cover the demands of medium format image sensors, this lens operates at a fixed focal length of 28mm — making it a compelling choice for photographers who need a wide perspective without the optical compromises that can come with zoom designs. The maximum aperture of f/4.5 is well-suited for controlled shooting environments where light can be managed, such as architectural interiors, landscapes, and studio work.

Autofocus is supported alongside full manual focus capability, giving shooters flexibility depending on their workflow and subject matter. The lens accepts filters via a 95mm front thread — a notably large diameter that reflects the optical demands of medium format coverage. Weighing in at 600g, it offers a substantial but manageable build for field use.

No image stabilization is present, so stable shooting platforms are recommended. Overall, this is a purpose-built wide prime for the Mamiya 645 ecosystem, prioritizing sharpness and a wide field of view in a medium format-native design.

Key Features — Phase One 28mm f/4.5 Aspherical

28mm Medium Format Prime: Fixed 28mm focal length provides a wide-angle perspective specifically engineered to cover medium format image sensors without optical compromise.

Aspherical Lens Elements: Aspherical optics reduce distortion and aberrations at the edges of the frame, critical for wide-angle medium format coverage.

Mamiya 645 Mount: Native mount ensures direct, full-featured compatibility with Mamiya 645-system bodies and Phase One digital backs.

Autofocus with Manual Override: Supports both autofocus and manual focus operation, giving shooters flexibility across different subject types and workflows.

f/4.5 Maximum Aperture: Well-suited for controlled environments such as architectural, landscape, and studio work where lighting can be managed.

95mm Filter Thread: Large-diameter front thread accommodates filters scaled to the optical demands of medium format coverage.

Lens Specifications — Phase One 28mm f/4.5 Aspherical

Phase One 28mm f/4.5 Aspherical full specifications
SpecDetail
Use CasesLandscape, Architecture, Real Estate
Lens TypeWide-Angle
FormatMedium Format
Zoom/PrimePrime
Focal Length28mm
Maximum Aperturef/4.5
Camera SystemMedium Format
Lens MountMamiya 645
AutofocusYes
Focus TypeAuto, Manual
Image StabilizationNone
Filter Thread95mm

Description — Phase One 28mm f/4.5 Aspherical

The Phase One Mamiya AF 28mm f/4.5 is a prime, wide-angle lens built for the medium format camera system, natively mounting via the Mamiya 645 lens mount. With a fixed focal length of 28mm and a maximum aperture of f/4.5, it is engineered to deliver a broad field of view across medium format image sensors. The lens supports both autofocus and manual focus, providing operational flexibility to suit different shooting workflows and subjects.

A 95mm filter thread accommodates large-format filtration, consistent with the scale of medium format optics. At 600g, the lens strikes a practical balance between optical capability and portability. No image stabilization is included, making a stable shooting platform advisable for optimal results. This lens is a dedicated option for photographers working within the Mamiya 645 ecosystem who need a wide-angle prime.

Pros — Phase One 28mm f/4.5 Aspherical

  • ✓Fixed 28mm focal length delivers a consistent wide-angle perspective for medium format shooting
  • ✓Supports both autofocus and manual focus (specifications: autoFocus: true, focusType: Auto/Manual)
  • ✓Large 95mm filter thread accommodates medium format-scale filtration needs

Cons — Phase One 28mm f/4.5 Aspherical

  • ✗Maximum aperture of f/4.5 is relatively modest, limiting low-light flexibility
  • ✗No image stabilization (specifications: imageStabilization: None), requiring steady technique or support
  • ✗95mm filter thread means filters are large-format and typically more expensive

Videos — Phase One 28mm f/4.5 Aspherical

The Camera That Changed It All — One Month Two Cameras

Resources & Downloads — Phase One 28mm f/4.5 Aspherical

Manuals & Guides

Frequently Asked Questions — Phase One 28mm f/4.5 Aspherical

What camera mount does this lens use?+
This lens uses the Mamiya 645 mount, as listed in the specifications. It is designed for Mamiya 645-system medium format cameras.
Does this lens support autofocus?+
Yes, the lens supports autofocus and can also be operated in manual focus mode. Both focus types are explicitly listed in the specifications.
What filter size does this lens require?+
The lens has a 95mm front filter thread. This is a large diameter, so be sure to source filters specifically in the 95mm size.
Does this lens have image stabilization?+
No. The specifications list image stabilization as None, so users should plan to shoot with a tripod or other stable support when working at slower shutter speeds.
How heavy is this lens?+
The lens weighs 600g according to the specifications, which is manageable for a medium format prime lens designed for field and studio use.

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