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Cokin P403 Hasselblad B70 Adaptor Ring P Series
Cokin P403 Hasselblad B70 Adaptor Ring P Series
Cokin P403 Hasselblad B70 Adaptor Ring P Series
Cokin P403 Hasselblad B70 Adaptor Ring P Series
Cokin

Cokin P403 Hasselblad B70 Adaptor Ring P Series

Bring the full Cokin P-Series filter system to your Hasselblad B70 glass — precise, secure, and built to outlast the filters it holds.

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Overview

The Cokin P403 Hasselblad B70 Adapter Ring is the mechanical connection point that brings the flexibility of the Cokin P-Series modular filter system to lenses equipped with the Hasselblad B70 bayonet mount. For Hasselblad photographers who work with graduated neutral density filters to balance exposures in landscape and architectural work, polarizers for managing reflections in water and glass, or creative color effects for film-style portrait and fine-art work, the P403 is the piece that makes those tools available without permanent lens modification. It attaches to the B70 bayonet and accepts the standard Cokin P-Series filter holder, opening up the full catalog of P-Series filters.

Constructed from black anodized aluminum, the P403 is built to withstand the handling demands of professional location work — the anodizing resists corrosion and wear while the anti-reflective surface prevents the light scatter and veiling flare that uncoated metal rings can introduce when shooting in high-contrast conditions. The machined fit holds the filter holder square and stable, which matters especially when positioning graduated filters precisely over a horizon line or architectural edge. For Hasselblad B70 users investing in a reusable filter system rather than disposable screw-in filters, the P403 is a durable, functional foundation that will outlast the filters it carries.

Key Features

Fits Cokin P-Series Filter Holder

Available sizes - 62mm through 112mm

Anti-Reflective Black Anodized Aluminum Construction

Will Stand Up To Years of Use

Specifications

Brand
Cokin
Model
P403
Compatibility — Lens Side
Hasselblad B70 bayonet
Compatibility — Filter Side
Cokin P-Series (M) Filter Holder
Construction
Anodized aluminum
Finish
Anti-reflective black anodized
Series
Cokin P Series

Pros & Cons

👍 Pros

  • Black anodized aluminum construction resists the corrosion and surface degradation that plastic B70 adapters develop after extended field use, particularly in humid or salt-air environments.
  • Anti-reflective anodizing eliminates internal ring reflections that can degrade contrast when shooting into strong light with a filter stack in place.
  • Provides access to the entire Cokin P-Series filter library — including graduated NDs, color grads, and creative effects — on Hasselblad B70 glass without permanent modification.
  • Machined aluminum construction holds filter holder alignment precisely, preventing the rotational drift that misaligns graduated filter transitions mid-shoot.

👎 Cons

  • The P-Series filter size is optimized for 35mm-format coverage — Hasselblad medium format users shooting at wide angles may encounter vignetting that the larger Cokin Z/X-Pro series would avoid.
  • Front lens cap use is blocked when the filter holder is mounted, requiring an extra step to protect the front element during transport or between shots.
  • No published tolerance specs or thread-engagement depth documentation, which makes it difficult to assess fit precision against the B70 bayonet before purchase.
  • The adapter ring alone provides no filter effect — the value depends entirely on which P-Series filters are also purchased.

Frequently Asked Questions

The Cokin P-Series filter holder is designed for 35mm-equivalent focal lengths — on medium format Hasselblad glass, the larger image circle increases the vignetting risk when using the P-Series holder compared to the larger Z/X-Pro series. For wide-angle Hasselblad lenses, verify coverage before committing to creative filter work on critical jobs.
The black anodized aluminum construction is more resistant to corrosion and surface wear than plastic alternatives, and the anodizing provides an anti-reflective finish that prevents internal reflections from degrading image contrast when strong light enters the filter stack from the side.
The P403 is machined for the Hasselblad B70 bayonet — it is not a threaded ring and cannot be step-ring adapted to other lens thread sizes. For other lens diameters, Cokin offers separate P-Series adapter rings in threaded sizes.
Attaching the Cokin P-Series filter holder to the P403 ring will block standard front lens cap use. You'll need to either remove the holder between shots or use a holder-compatible front cover if lens protection during transport is a priority.
The standard Cokin P-Series filter holder accepts up to three P-Series filters simultaneously. The number you can practically stack without image-quality degradation from stray light or mechanical vignetting depends on the focal length in use.

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