Metabones MARK IV EF-E Smart Adapter Update Plus NEW MFT Speed Booster Turns GH4 into a S35 Camera

June 5, 20153 Comments

Metabones Adapter

A little update for the Metabones EF-E Smart Adapter MARK IV fixes a few niggle things but doesn’t add any new features. No the auto focus speed still is what it is. Below are the links and what the update consists of.


This information is for the following models:



  • Name: Firmware update V0.41 for EF-E Smart AdapterTM MARK IV
  • Release date: 1 Jun 2015
  • Benefits and improvements:
    • User may choose between lens OIS and IBIS using the lens’ IS switch (except for some Tamron lenses). If the lens’ IS switch is ON, lens OIS is used and IBIS is turned off automatically. If lens’ IS switch is OFF, IBIS is used instead. To turn off all IS, hold down the WO button on the adapter while switching the lens’ IS to the OFF position.
    • IS is always turned on during magnified focus assist for ease of manual focusing
    • Added autofocus support for some legacy lenses on A7 series
    • Eliminated iris flicker when opening up the iris from a slower aperture to a faster aperture in Green mode on FS series, NEX-VG series and A7 series in movie mode.
    • Eliminated iris tick noise while zooming a variable aperture zoom lens in Green mode

Canon EF Lens to Micro Four Thirds T Speed Booster XL 0.64x

Metabones updated another adapter and this one is mind blowing. The new Canon EF Lens to Micro Four Thirds T Speed Booster XL 0.64x basically turns the GH4 into a APS-C or S35 camera. It reduces the full-frame crop factor of the Panasonic GH4 from 2.0x to 1.28x transforming these cameras into APS-H format. Crazy!

Canon EF Lens to Micro Four Thirds T Speed Booster XL 0.64x Key Features

  • Increase maximum aperture by 11/3 stops
  • Increase MTF.
  • Makes lens 0.64x wider.
  • Build-in electronics to control lens aperture.
  • The lens aperture is set by the controls on the camera body.
  • Powered by camera body. no external power source required.
  • High performance 32-bit processor and efficient switched-mode power supply.
  • The interior is painted with flocking coating to further reduce the internal reflection.
  • The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.
  • Support Panasonic GH4, GH3, G3, G5, G6, G10, GF3, GF5, GF6, GX1, Olympus E-PL7, Blackmagic Cinema Camera with Micro Four Thirds mount**, Blackmagic Pocket Cinema Camera***

Optics designed by Caldwell Photographic in the USA (patent pending).


For now the Speed Booster XL 0.64x is only available direct from Metabones. I’m sure it will be in retail stores soon. It’s a expensive little bugger at $649 US.

Detailed info can be found HERE

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Filed in: 35mm LensFeatured PostGH2GH3GH4Lens TalkLensesMicro Four Third LensesMicro Four ThirdsMirrorlessPanasonic
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About the Author ()

I'm a broadcast DP In San Diego. I enjoy sharing what I'm working on and testing new equipment. This blog is also part of giving back. I've learned so much from so many people.

Comments (3)

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  1. M.J.Carmody says:

    I have two a7s for weddings, but am tempted by this. A second-hand gh4 and one of these new MFT speedboosters would be a very cost-effective way to shoot 4k video from the back of the room as high-quality wide angle backup view of the main table/action using my existent Canon glass. Very, very interested in this one! Thanks for the update Eric.

  2. Mike delos reyes says:

    Holy cow…. this makes me want to sell my native m43 lenses… so f4 lenses become what? 2.2? 2.4? My mind is blown…

  3. John says:

    Hi, i see that on the smart adapter mark IV some lenses are autofocus, is there some lens autofocus lenses with the XL 0,64 with GH4 (canon lenses… or others .. ?


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