Metabones Canon EF to Micro FourThirds T Speed Booster XL 0.64x (Black)

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  • Canon EF Lens to Micro Four Thirds
  • Increases maximum aperture by 1 1/3 stop
  • Increases MTF
  • Makes lens 0.64x wider
  • Patented 6-element/4-group optical design
  • Supports 4k video mode with DX lenses
  • Auto focus on Panasonic MFT cameras
  • Iris/aperture controlled by camera body
  • Image stabilization (IS) lens support
  • Electronic manual focusing
  • Detachable tripod foot
  • Flocking material coating
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Our Price: $649.00

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A new Micro-4/3 mount Speed Booster® adapter designed exclusively for the Panasonic GH4 and other selected Micro Four Thirds cameras (refer to the below camera compatbility table), with a magnification of 0.64x.  The Speed Booster XL 0.64x uses an advanced 6-element optical design to achieve extraordinary optical performance at apertures up to an incredible f/0.80, a new record for Micro Four Thirds format. 

The new Speed Booster XL 0.64x reduces the full-frame crop factor of the Panasonic GH4 from 2.0x to 1.28x, thus effectively transforming these cameras into APS-H format.  When the GH4 is used in Cinema 4k video mode the horizontal full frame crop factor is reduced from 2.34x to 1.50x, thus effectively transforming the GH4 into a super-35 format 4k cine camera.  In addition, the speed of any attached lens is increased by 11/3 stops, with a maximum output aperture of f/0.80 when an f/1.2 lens is used.  For example, a 50mm f/1.2 becomes a 32mm f/0.80, which is the fastest aperture available for full size Micro Four Thirds format. 


Compatible Lenses:

  • Canon EF 8-15mm f/4L USM Fisheye
  • Canon EF 20-35mm f/3.5-4.5 USM
  • Canon EF 24-105mm f/4L IS USM
  • Canon EF 28-80mm f/3.5-5.6 II
  • Canon EF 35-80mm f/4-5.6
  • 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 STM
  • Canon EF 85mm f/1.2L USM (Mark I)
  • Canon EF 70-200mm f/2.8L IS USM (Mark I)
  • Canon EF 70-200mm f/2.8L IS II USM
  • Canon EF 70-300mm f/4-5.6L IS USM
  • Canon EF 85mm f/1.2L II USM
  • Canon EF 100mm f/2.8L IS Macro USM
  • Canon EF 100mm f/2.8 Macro USM
  • Canon EF 100-400mm f/4.5-5.6L IS USM
  • Canon EF 100-400mm f/4.5-5.6L IS II USM
  • Canon EF 200mm f/2.0L IS USM
  • Canon EF 300mm f/2.8L IS USM (Mark I)
  • Canon EF 400/2.8L IS USM (Mark I)
  • Canon EF Extender 1.4x III
  • Canon EF Extender 2x
  • Sigma 18-35mm f/1.8 DC Art
  • Sigma 18-125mm f/3.8-5.6 DC HSM
  • Sigma 24-105mm f/4 Art
  • Tokina AT-X PRO 11-16mm f/2.8 DXII

The following lenses are compatible with the Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x, however, they’ve been found to be inaccurate in terms of focusing.


  • Canon EF 50mm f/1.8 II*
  • Canon EF 70-200mm f/4L USM (non-IS)*
  • Canon EF 135mm f/2L USM*
  • Canon EF 200mm f/2.8L II USM*
  • Canon EF 300mm f/4L IS USM*
  • Sigma 50mm f/1.4 EX HSM
  • Tamron SP 24-70mm f/2.8 Di VC USD A007
  • Tamron 28-300mm f/3.5-6.3 XR Di VC A20
  • Tamron SP 70-200mm f/2.8 Di VC USD A009

*Tested as accurate on newer cameras, such as the Panasonic G7 and GX8.




  • Canon EF-S lenses will require modification to mount onto the adapter, however, third-party APS-C lenses can be used without modification.
  • EF-S and third party DX lenses may not cover the full Micro Four Thirds sensor in still photo and FHD video modes (but will cover 4k video mode)
  • Not compatible with autofocus in video on Olympus cameras. 
  • AFC (continuous autofocus) and AFF (flexible autofocus) modes are not supported. 
  • Panasonic video autofocus may hunt more than a native lens or have unsatisfactory performance. 
  • No support for Focus Stacking and Focus Bracketing on Olympus cameras. 
  • Programed exposure mode and shutter priority mode should not be used in video. 
  • Supports only Panasonic GH4, GH3, G3, G5, G6, G7, G10, GF3, GF5, GF6, GX1, GX8, Olympus E-PL7, Blackmagic Cinema Camera with Micro Four Thirds mount**, Blackmagic Pocket Cinema Camera***

Metabones Speed Booster XL 0.64x Specifications:

  • Magnification:  0.64x
  • Crop Factor for Full Micro Four Thirds format:  1.28x
  • Crop Factor with GH4 in Cinema 4k (4096 x 2160) Video Mode:  1.5x
  • Maximum Output Aperture:  f/0.80 (with f/1.2 lens attached)
  • Rectilinear Distortion:  < 0.8%
  • Lens Elements/Groups:  6/4
  • Length Reduction:  6.2 mm
  • Camera Mount:  Micro Four Thirds
  • Image Format:  17.3 mm x 13.0 mm (full Micro Four Thirds format)

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Physical Specifications
Color: Black
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Brand: Metabones

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  • Metabones Canon EF to Micro FourThirds T Speed Booster XL 0.64x (Black) MB_SPEF-E-BT2

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