Metabones Canon EF to Micro FourThirds Speed Booster ULTRA 0.71x

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  • Canon EF Lens to Micro Four Thirds
  • Increase maximum aperture by 1 stop
  • Increase MTF of any lens attached
  • Makes lens 0.71x wider
  • Auto focus on Panasonic MFT cameras
  • Iris/aperture controlled by the camera body
  • Image stabilization (IS) lens support
  • EXIF (focal length, aperture, zoom range)
  • Detachable tripod foot
  • Flocking material coating
Our Price: $649.00

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Change the way you capture high-quality photographs by using the Metabones Canon EF to Micro Four Thirds Speed Booster Ultra. This adapter allows you to use any Canon EF mount lens on your Micro 4/3 camera bodies while maintaining autofocus and electronic aperture/iris control. It increases the width of the attached lens by 0.71x. This speed booster also increases the maximum aperture by one stop and the MTF of any lens attached. For added convenience, this accessory also works with stabilized lenses and bodies, allowing for blur-free photographs. Finally, you can power this speed booster through the camera body itself or a third party 5V external power source.

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.
  • Some EF-S and DX lenses may not have enough coverage of the entire imaging circle for stills after widening by 0.71x, but will be okay in video . 
  • 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. 
  • Will not work with Super 35mm video sensors. 

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Physical Specifications
Color: Black
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Brand: Metabones

In The Box

  • Metabones Canon EF to Micro FourThirds Speed Booster ULTRA 0.71x

Included in Rental:

  • Metabones Canon EF to Micro FourThirds Speed Booster ULTRA 0.71x
  • Case
  • Front Cap
  • Rear Cap
  • Support Bracket

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