Metabones Firmware Upgrade Adds Native AF and Smooth Iris to EF Smart Adapters


[UPDATE 7/1/16: Metabones has released firmware update 0.52 that replaces this version. The links below will take tou to the latest version]

Metabones has just announced a major firmware upgrade that adds Native AF and Smooth Iris to their Canon EF Lens to Sony E-Mount Metabones Smart Adapter IV and Metabones Speed Booster ULTRA.

Vancouver, Canada, June 23, 2016: Metabones releases Metabones App 2.3, a major firmware update with the following additional features.

• Eye-AF (a6300/a7 series).
• Fast contrast detect AF for all E-Mount cameras.
• DMF (direct manual focus) for E-Mount cameras, where the camera switches to MF as soon as AF completes. This is useful for checking AF accuracy when used with focus peaking.
• Smooth iris for Sony E-Mount and FZ-Mount cameras and Blackmagic, JVC and Panasonic Micro Four Thirds Mount cameras.

Metabones has already added fast EF lens autofocus to its Micro Four Thirds Mount Speed Boosters and Smart Adapters last year. With this speedy advantage now extended to E-Mount, EF-Mount lenses are now capable of focusing quickly across the widest variety of mirrorless cameras with trusted Metabones precision and reliability.

The smooth iris feature slows down the movement of the electromagnetic aperture diaphragm so that video footage transitions smoothly when the aperture changes, with reduced tick noise from the lens. The latest Canon and Tamron SP lenses have special support for this feature and Metabones makes use of it if the lens supports it.


E-Mount “native” autofocus features may not work with all lenses.
“Native” autofocus may be lesser in performance and/or accuracy compared to the original “Green” mode phase-detect autofocus for a6300, a7II and a7RII.

AF-C and video autofocus may have unsatisfactory AF performance and/or accuracy. This is a limitation inherent in DSLR lenses, which lack the low latency required for making many fine movements in rapid succession during AF-C and video focusing.

Excessive hunting may occur if a small aperture is used with AF-C, video or “Liveview Display Setting Effect” turned on.

The first few autofocus attempts may result in false positives where the camera gives focus confirmation but the subject is not in focus. This issue goes away on its own after a few trials with most lenses.
No support for in-camera correction such as peripheral shading, CA and distortion.

Power consumption may increase and battery life may shorten compared to the original “Green” mode autofocus.
Actuations of the electromagnetic aperture diaphragm and/or the focus motor of the lens result in noises which may be picked up by the camera’s internal microphone during video recording. Use of an appropriately placed external microphone is required for video work.

The aperture moves in 1/3 stop steps with most Panasonic cameras and 1/8 stop steps with other cameras, which may be noticeable in video recordings. Programmed exposure mode and shutter priority exposure mode should not be used for video. Lenses supporting “smooth iris” smooth out the transition but do not increase iris resolution.

The following lenses have been tested for “native” AF. Refer to Metabones’ web site for the most up-to-date list. Lenses equipped with smooth iris support are marked with asterisks. APS-C lenses are not compatible with Speed Booster.

Canon EF 8-15mm f/4L USM Fisheye*
Canon EF-S 17-55mm f/2.8 IS USM
Canon EF-S 18-55mm f/3.5-5.6 IS II*
Canon EF 24-105mm f/4L IS USM
Canon EF 28-80mm f/3.5-5.6 II
Canon EF 40mm f/2.8 STM*
Canon EF 50mm f/1.2L USM
Canon EF 50mm f/1.4 USM
Canon EF 70-200mm f/2.8L IS II USM*
Canon EF 70-200mm f/4L USM (non-IS)
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 USM Macro*
Canon EF 100-400mm f/4.5-5.6L IS USM (I)
Canon EF 100-400mm f/4.5-5.6L IS II USM*
Canon EF 200mm f/2.8L II USM
Canon EF 300mm f/4L IS USM
Sigma 18-35mm f/1.8 DC HSM Art 013
Sigma 24-105mm f/4 DG OS HSM Art 013
Sigma 50mm f/1.4 EX DG HSM
Tamron SP 24-70mm f/2.8 Di VC USD A007
Tamron SP 45mm f/1.8 Di VC USD F013*
Tamron SP 70-200mm f/2.8 Di VC USD A009*

Incompatible lenses: (“Green” mode PDAF is still supported on A6300, A7 Mark II and A7R Mark II.)

Canon EF 50mm f/1.8 II
Canon EF 100mm f/2.8 USM Macro
Canon EF 135mm f/2L USM
Contax N lenses modified to EF mount by Conurus Canada
Sigma 18-125mm DC OS HSM
Tamron SP 17-50mm f/2.8 Di II VC B005
Tamron 28-300mm f/3.5-6.3 (IF) Macro A20

OSX and Windows versions of the firmware updater are available for download from Metabones’ web site. The same download updates Speed Booster ULTRA, Smart Adapterâ„¢ Mark IV, EF to FZ Mount Smart Adapter and all EF Mount to Micro Four Third mount products. Updates to earlier Smart Adaptersâ„¢ (I, II and III) and the original Speed Booster are by factory only and are free of charge except for shipping.

Downloads Links:

Firmware update for EF-E Smart Adapter IV and EF-E Speed Booster ULTRA (MAC)
Firmware update for EF-E Smart Adapter IV and EF-E Speed Booster ULTRA (WIN)
Firmware update for EF-M43 (MAC)
Firmware update for EF-M43 (WIN)

About Metabones

Metabones, together with its allied partners Caldwell Photographic and WB Design, is the pioneer and leader of two key technologies which have catalyzed the transition from mirror to mirrorless. Speed Booster (winner of the 2013 TIPA Best Photo Accessory Award) makes lenses brighter, wider and sharper, and Smart Adapter breaks the lens mount compatibility barrier by electronically integrating interchangeable single-lens reflex (SLR) lenses and mirrorless cameras. Metabones offers a comprehensive range of adapters covering most popular lens mounts, as well as some rare and exotic ones. “Always on the forefront of innovation without ever setting aside practicality as a professional tool” perhaps best epitomizes Metabones’ philosophy.

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10 thoughts on “Metabones Firmware Upgrade Adds Native AF and Smooth Iris to EF Smart Adapters”

  1. So “strange” that the 24-70mm II has not been “tested”.

    What about Zeiss ZE, Sigma and Rokinon- lenses that have Canon-mounts-onto Metabones IV – how come they are NOT even mentioned anywhere jet (so as to be able to captivate and maintain interactive tragic on the subject..) ?

    1. I’m certain that Metabones tested every lens they could get their hands on.

      As for Zeiss ZE and Rokinon EF lenses, there is absolutely no reason to test them since Manual Focus lenses are not compatible with AF features like Eye AF…

  2. Sorry Brian, i don’t get what this post is about. You haven’t added anything to what Metabones published? At least the folk over at Preview made some commentary. So what are your thoughts / experiences?

      1. This release was sent to me by Metabones prior to their announcement and I posted it because I believed it would be of interest to readers of this blog. Other sites that posted the same content certainly felt the same way.

  3. Thanks for sharing this sir! Have you had a chance to test it? I’ve read a lot about performance being slower in all aspects (noted in the “Limitations” section), so I’m a little reluctant to try it.
    Thanks again

    1. I don’t own any Canon glass so a full test involves a flight to New York where I can get my hand a a fairly full Canon lens line-up. I only intended to test these adapters ONCE. I cannot justify the cost and time it takes to re-test, but I’m very happy that Metabones has used my tests to improve their product – unlike the other adapter makers who don’t offer firmware updates.

        1. I see ZERO value in testing one lens. Even with all the lenses tested by Metabones, everyone seems to only be interested in what was not tested.

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