Metabones Nikon G to GFX Fuji G-Mount (MB-204)

Metabones Nikon G to GFX Fuji G-Mount (MB-204)

Metabones Nikon G to GFX Fuji G-Mount (MB-204)

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The Metabones Nikon G to GFX Fuji G-Mount (MB-204) allows Nikon F mount lenses to be mounted on Fujifilm GFX camera bodies without getting dark and / or soft corners. The magnification factor of 1.26x perfectly matches the image circle of the full-frame Nikon lenses to the medium-format sensor of the GFX series cameras, and therefore the diagonal FOV remains exactly the same.

The optical design consists of 5 elements in 3 groups, incorporating ultra-high index Lanthanum-based optical glass as well as one element made of fused silica, resulting in extremely good performances with professional-grade f/2.8 zoom lenses. For example, a 24-70mm f/2.8 lens becomes a 30-88mm f/3.5 zoom, and a 70-200mm f/2.8 lens becomes an 88-252mm f/3.5 zoom.

Please note that because of the nature of focal extenders, the aperture values decrease by 2/3 of a stop; f/2.8 becomes f/3.5 and f/2 becomes f/2.5. High-speed fixed focal length lenses such as the 50mm f/1.4 will be transformed into a very fast standard lens 63mm f/1.8 for the GFX system.


  • Nikkor F-mount lens
  • include Nikkor G series, AF-D, AI-P, AIS, AI and non-AI lens only.


  • Nikkor DX lenses and third-party lenses designed for APS-C format used in conjunction with this Expander may cause the vignetting due to the limitation of image coverage.
  • Nikkor 2.1cm f/4
  • Nikkor AI-S 20mm f/2.8
  • Nikkor E series lens, the diaphragm blades are not operated by mechanical linkage levers, such as Nikkor 105mm f/1.4E, Nikkor AF-S 70-200mm f/2.8E FL ED VR, Nikkor AF-S 16-80mm f/2.8-4E ED DX VR, and Nikkor AF-S 24-70mm f/2.8E ED VR, Nikkor AF-S 600mm f/4E FL ED VR and PC-E 19mm, 24mm, 45mm, 85mm T/S Lens, etc.
  • This adapter is manual aperture control. It does NOT support electronic aperture control, AF and image stabilization.
Camera MountFUJIFILM G
Lens MountNikon F
Nikon Lens CompatibilityG-Type Lens
Optical Design5 Elements in 3 Groups
  • Allows a Nikon F-mount lens to be used with a FUJIFILM G-Mount GFX camera
  • Maximizes apparent angle of view of combined camera and lens
  • Attached lens can focus to infinity
  • Five high-index lanthanum-based glass lens elements in three groups for enhanced optical clarity as well as colour fidelity
  • Integrated, eight-stop aperture-control ring with half-stop increments provides aperture control for Nikon G-type as well as Nikon AI or many post-Nikon AI lenses
  • Detachable Arca-type compatible tripod foot with 1/4"-20 threads
  • Internal coating minimizes reflections within the adapter barrel
  • Aluminum alloy components for weight reduction
  • Brass mounting rings further prevent wear-and-tear