Metabones Canon EF to Micro Four Thirds Speed Booster is Now Shipping

The Metabones Canon EF Lens to Micro Four Thirds Speed Booster Adaptor was a long anticipated and highly demanded optical adapter that is now finally shipping.

It will turn your trusted GH4 camera into a Super 35mm 4K beast. Now, you can use your collection of Canon EF lenses on any camera with a Micro Four Thirds mount such as the Panasonic GH4, the Blackmagic Cinema Camera MFT, and the Blackmagic Pocket Cinema Camera.

The EF to Micro Four Thirds Metabones Speedbooster also supports IS (image stabilization) and gets power direct from the camera, which eliminates the need for additional power sources, which add more bulk to any camera rig and some cost a few $/£. 

I personally prefer to use my trusted Canon EF glass, rather than investing into a whole new Micro Four Thirds lens kit. So, even at $599, I think the Metabones EF to Micro 4/3 is a worthy investment and definitely deserves consideration when thinking about a lens kit for your GH4/BMPCC.

Metabones are known for their high-quality adapters. They use precision-machined brass with chromium plating on both the camera-body and the lens sides of their adapters, in order to ensure smooth mounting, great appearance, and durability.

The lens side of the adapter features a strong leaf-spring structure, strengthening the adapter-lens connection and ensuring tightness of the lens in order to reduce wear and prevent focus errors and optical alignment issues from appearing.

Matte-black treatment was used by the company to keep internal reflection to a minimum in order to maintain the maximum optical quality possible with the lens. Metabones adapters are very solid in terms of build quality and outstanding finish.

Here are the main features of the brand new Canon EF to Micro 4/3 Speed Booster Adapter:

  • The adaptor increases the maximum aperture of the attached lenses by 1 stop. 
  • Makes lens 0.71x wider.
  • It has build-in electronics to control lens aperture.
  • The lens aperture is set by the controls on the camera body.
  • The adaptor is powered by camera body. No external power source required. (also accept 3rd party external power supply via MicroUSB socket) 
  • It has high performance 32-bit processor and efficient switched-mode power supply.
  • The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.

This Smart Adapter is designed to cover a 17.3mm x 13mm sensor and it is the perfect fit for the Micro Four Thirds sized sensor of the GH4. However, there are some important notes that you should consider before using the adapter.

A third party zoom lens may need to be registered with the Speed Booster first in order to detect its maximum aperture. Some improperly-made M42 screw mount adapters may short the electronic contacts of the Smart Adapter and cause damage to the Smart Adapter/Speed Booster and/or camera body.

Many manual focus lenses (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of the adapterThey need to be modified before they can be safely used on the SpeedBooster/Smart Adapter. Check and make sure there are no rear protrusions from the adapter/lens combination before using on your camera. Scratches and damages caused by rear protrusions on the adapter are not covered by the manufacturers warranty.


The lenses that Metabones has already tested are:

  • Canon 50mm f1.8
  • Canon 50mm f1.4
  • Canon 85mm f1.2
  • Canon 100mm f2.8
  • Canon 20-35mm f3.5-4.5
  • Canon 28-80mm f2.8-4L
  • Canon 70-200mm f2.8L
  • Canon 24-70mm f2.8 II
  • Canon 24-105mm f4 L
  • Canon 70-200mm f4 L
  • Canon 70-300mm f4-5.6L
  • Canon 70-300mm f4-5.6
  • Sigma 18-200mm f3.5-6.3
  • Zeiss 35mm f2.

You can order the adapter from B&H or through other authorised dealers.

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