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Silver cylindrical cinema lens with drop-in filter holder, Canon RF mount, 50mm T1.9, 77mm filter thread, 80mm front diameter

Nisi

NiSi Athena Prime 50mm T1.9 Cine Lens Canon RF 77mm 80mm 300° focus

SKU CH-WF9D-DET79

Full-frame 50 mm cine lens with T1.9 aperture, 300° focus rotation, 77 mm filter thread, 80 mm front and drop-in filter holder for Canon RF

  • Full-frame coverage with 50mm focal length for detailed cinematic visuals
  • Wide T1.9 aperture enables superior low-light shooting and beautiful bokeh
  • 300-degree focus rotation with dual scales for precise manual focus pulls
  • Innovative drop-in filter mount allows quick filter changes without lens removal
  • 80mm front diameter and 77mm filter thread provide versatile filter compatibility

Lens identity

The NiSi Athena Prime 50mm T1.9 is a full-frame cinema lens built for the Canon RF mount. It covers a 50mm focal length with a maximum aperture of T1.9 and includes a drop-in filter holder for flexible workflows. The 80mm front diameter and 77mm filter thread add matte-box compatibility and screw-in filter options.

Who benefits

Filmmakers who need precise manual focus pulls will value the 300-degree rotation and dual-scale markings. The T1.9 aperture suits low-light narrative work and shallow depth-of-field storytelling. Shooters requiring autofocus, electronic aperture control, or stabilisation should consider alternatives that provide those functions.

Sustained operation

The all-metal barrel and extended focus throw maintain consistent resistance during long takes, reducing focus-breathing shifts. The drop-in filter system allows ND changes without breaking rig balance, while the 77mm thread accepts protective glass that stays mounted between setups. Thermal stability keeps infinity focus repeatable across temperature swings.

Highlights

  • Full-frame coverage with 50mm focal length for detailed cinematic visuals
  • Wide T1.9 aperture enables superior low-light shooting and beautiful bokeh
  • 300-degree focus rotation with dual scales for precise manual focus pulls
  • Innovative drop-in filter mount allows quick filter changes without lens removal
  • 80mm front diameter and 77mm filter thread provide versatile filter compatibility

Specifications

No published specifications for this item yet.

Questions about this item

Does my camera need a Canon RF mount for this 50mm T1.9 lens to work?

Yes, the lens is built for Canon RF mount cameras and will not attach to other mounts without an adapter.

Will my existing 77mm screw-on filters fit the front thread of this 80mm-front cine lens?

Yes, the barrel includes a standard 77mm filter thread so your current circular filters screw on directly.

How can I confirm the 300-degree focus rotation is calibrated correctly after mounting the lens?

Turn the focus ring through its full travel; the metric and imperial distance scales should move smoothly across the entire 300-degree range without binding.

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