Metabones Canon EF Lens to Fuji G-mount T Smart Expander 1.26x (GFX) 富士GFX系列转佳能EF卡口 适配器 1.26x 转接环 MB_EPEF-FG-BT1


Lens iris/aperture is set by the controls on the camera body. Optical image stabilization (IS) lens support. Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lens models. Focal length and aperture are adjusted in EXIF (see note 3).

Key Features





* Note: Aperture values decrease by 2/3 of a stop used in conjunction with this Expander. 


  • In some rare cases lens hoods designed for 3:2 may need to be removed for 4:3 use with Smart Expander.
  • Each lens needs to go through a calibration procedure <click to view>  when first used. Refer to the online user manual on Metabones' web site for instructions.
  • Autofocus may have unsatisfactory performance and may not work at all with some lenses
  • For video autofocus, increasing FOCUS SENSITIVITY and decreasing AF SPEED are required under the AF-C CUSTOM SETTING (MOVIE) menu.
  • For video, aperture priority or manual exposure is recommended to avoid exposure flickering. EF lenses are not capable of fine-grained control of the aperture required by Fujifilm cameras.
  • AF+MF and lens aberration correction are not supported.
  • Some film-era lenses may not be able to achieve sufficient AF accuracy required for digital cameras. Worn lenses with faulty sensors may lead to AF problems on a mirrorless camera even though the lens may appear to function normally on a DSLR.
  • Aperture diaphragm makes frequent noises with older lenses. Use aperture priority and manual exposure modes, or use a lens which supports smooth iris.
  • With IS/OS/VC lenses the IS MODE setting is ignored and both SHOOTING ONLY and CONTINUOUS modes behave in the same way which is similar to a Canon camera but different from what Fujifilm OIS lenses do. This is done to maximize IS effectiveness. A negative consequence of this is that there may be no OIS during focus check.
  • MF Distance Display does not work (although AF Distance Display does, if the lens transmits distance information). Since Metabones has a track record of releasing new firmware updates which significantly improve the features, performance, compatibility and reliability of existing products, these limitations are subject to change in the future. Please refer to the product pages on Metabones' web site for the most up-to-date disclosure.


Unsupported List 
  • EF-S lens. EF-S lenses require modification to fit or may remain incompatible even after modification.
  • Lens correction such as peripheral shading, CA and distortion
  • Focus confirmation "chip" (e.g. Dandelion)
  • M42 screw mount adapters (see note 3)
  • Stacking non-Metabones/non-Conurus mount adapters on top (see note 4 and list of lenses which require modification below.)


Metabones Expander 1.26x

The EF - GFX Expander 1.26x allows Canon EF 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 Canon EF lenses to the medium-format sensor of the GFX series cameras, and therefore the diagonal field-of-view (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.

Due to 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 63mm f/1.8 standard lens for the GFX system.

The EF-GFX mount Smart Expander features Metabones’ electronic integration, including phase-detection autofocus (PDAF), in-body image stabilization (IBIS), optical image stabilization (called IS/OS/VC by various lens manufacturers) and smooth iris. The button on the Smart Expander toggles between auto aperture (programmed exposure or shutter priority) and manual aperture (aperture priority or manual exposure). If a manual lens with no electronics is attached, the button brings up the manual lens selection on the camera body so that focal length can be chosen for correct IBIS operation and EXIF. 


Tested Cameras
  • Fujifilm GFX 50S, GFX 50R and GFX 100


Tested Lenses

Smooth Iris



Canon EF 40mm F/2.8 STM

Canon EF 50mm F/1.2L USM

Canon EF 50mm F/1.4 USM

Canon EF 50mm F/1.8 II 

Canon EF 50mm F/1.8 STM

Canon EF 85mm F/1.2L II USM

Canon EF 100mm F/2.8 USM Macro

Canon EF 100mm F/2.8L IS USM Macro

Canon EF 135mm F/2 L USM

Canon EF 200mm F/2.8L II USM

Canon EF 300mm F/2.8L IS II USM

Canon EF 300mm F/4L IS USM

Canon EF 400mm F/5.6l

Canon EF 8-15mm F/4L Fisheye

Canon EF 16-35mm f/2.8L II USM

Canon EF 17-35mm F/2.8L USM

Canon EF 24-70mm F/2.8L II USM

Canon EF 24-70mm F/2.8L USM Mk1

Canon EF 24-105mm F/4L IS USM

Canon EF 28-70mm F/3.5-4.5 II 

Canon EF 28-135mm F/3.5-5.6 IS USM

Canon EF 28-80mm F/3.5-5.6 III USM

Canon EF 70-200mm F/2.8L IS II USM

Canon EF 70-200mm F/4L IS II USM

Canon EF 70-200mm F/4L USM

Canon EF 70-300mm F/4-5.6 L IS USM

Canon EF 100-400mm F/4.5-5.6 L IS II USM

Canon EF TS-E 17mm f/4L

Canon EF TS-E 24mm f/3.5L II

Sigma 24mm F/2.8 Super Wide II 

Sigma 35mm F/1.4 DG Art 012

Sigma 50mm F/1.4 DG HSM non art

Sigma 135mm F/1.8 DG HSM Art 017

Sigma 24-35mm F/2 Art 015

Sigma 24-105mm F/4 OS HSM Art 013

Tamron 45mm F/1.8 VC (F013)

Tamron 10-24mm F/3.5-4.5 VC HLD (B023)

Tamron 15-30mm F/2.8 VC (A012)

Tamron 17-50mm F/2.8 VC (B005)

Tamron 18-250mm F/3.5-6.3 Di II (A18)

Tamron 18-270mm F/3.5-6.3 Di II VC (B003)

Tamron 18-270mm F/3.5-6.3 Di II VC PZD (B008)

Tamron 24-70mm F/2.8 Di VC USD (A007)

Tamron 28-300mm F/3.5-6.3 XR Di (A06)

Tamron 35-150mm F/2.8-4 Di VC OSD (A043)

Tamron 70-210mm F/4 Di VC USD (A034)

Tamron 70-300mm F/4-5.6 Di VC USD (A005)

Tokina 50mm F/1.4 Opera

Zeiss ZE 18mm F/3.5mm Distagon

Canon EF-Extender (Teleconverter)



Note :



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