Firmware Updates for Metabones EF-E Smart Adapter Mark IV


Metabones Smart Adapter IV (B&H) users should be aware that Metabones offers firmware updates so frequently that even if you just purchased your adapter, chances are fairly good the firmware may not be up to date. It’s well worth keeping firmware up to date since firmware updates improve focus speed and accuracy when using Canon EF lenses on Sony E-Mount Cameras including Sony A7, A7R, A7S and A7II.

Get the latest Firmware update for Metabones EF-E Smart Adapter Mark IV: MAC | WIN


Firmware update V0.41 for EF-E Smart Adapter 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
• Eliminates 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.
• Eliminates iris tick noise while zooming a variable aperture zoom lens in Green mode


Firmware update V0.40 for EF-E Smart Adapter MARK IV

Release date: 3 Feb 2015
Benefits and improvements:
• series lenses. You may for example assign “Aperture Preview” to the the “Focus Hold” button on A7II and get the same DOF preview function as on a Canon DSLR. Image Stabilization ON/OFF status is displayed on A7II as the SteadyShot icon. “‹
• Adds support for Sony A7s silent shutter mode.
• Fixed Sony A7s intermittent startup issue.
• More detailed EXIF data.
• Reliability improvements with some Sigma and Tamron lenses.
• Fixed distance display (in Advanced mode) on VG, FS and A7 series.
• Fixed EF70-200/2.8L IS II USM’s IS on/off switch intermittently inoperative issue.
• Fixed issue of EF40/2.8 STM being wrongly identified as an OSS lens.
• Fixed NEX-5N becoming unresponsive issue when movie capture started

Firmware update V0.39 for EF-E Smart Adapter MARK IV

Release date: 29 Dec 2014
Benefits and improvements:
• “‹Improves Sony A7S compatibility

Firmware update V0.37 for EF-E Smart Adapter MARK IV

Release date: 20 Nov 2014
Benefits and improvements
• Improves stability with some lenses

Firmware update V0.36 for EF-E Smart Adapter MARK IV

Release date: 31 Oct 2014
Benefits and improvements
• Fixes Zeiss ZE lens stability issue with adapter firmware version 0.33 and version 0.34″‹

Firmware update V0.34 for EF-E Smart Adapter MARK IV

Release date: 8 Oct 2014
Benefits and improvements
• Bug Fix and Improve the performance.
• Fix Auto-Magnify/MF function on advance mode.

Firmware update V0.32 for EF-E Smart Adapter MARK IV

Release date: 14 Aug 2014
Benefits and improvements:
• Sony A7S compatibility



Apple Mac OS X 10.9 Mavericks or later


Windows Vista SP2
Windows 7 SP1
Windows 8
Windows 8.1


• When performing the firmware update, please don’t disconnect the USB cable, otherwise, the adapter may become inoperable due to the sudden power shutdown
• Don’t connect the adapter to any camera and lens when performing the firmware update.
• Make sure that you are logged on as a user with administrative rights.
• Read the disclaimer and click to agree to the terms and conditions. Then, click on the Download button.
• The download of the [MAC: MetabonesApp.dmg] or [WIN: MetabonesApp.exe] file will start.
• Save the file to the desktop of your computer (recommended).


Once the file has downloaded successfully, you’re ready to upgrade the Firmware update for the Smart Adapter MARK IV.

STEP 1: START UP THE Metabones App

• Close all currently running programs on your computer.
• Double-click the [MAC: MetabonesApp.dmg] or [WIN: MetabonesApp.exe] download file to start the Metabones App.
• Connect your the Smart Adapter MARK IV to the computer by using the USB-MicroUSB cable that came with your Sony camera.
• Then, follow the instructions in the Metabones App to update the firmware.


• Only connect the adapter – REMOVE the camera and lens
• Connect a USB cable to USB port behind the lens release lever
• Once adapter connected via USB, the app will tell you if an update is available.
• If an update is available, follow the prompts:
• Unplug USB – Press and Hold Button (center of photo above) – then reconnect USB to start the update.
• DO NOT disconnect until the Update is finished.

You’ll get a screen prompt telling you once Firmware has successfully updated and you’re done.

PLEASE NOTE: I strongly advise using the USB-MicroUSB cable that came with your Sony camera – other cables may not work.

Related Posts:

Metabones Smart Adapter IV for Sony A7/A7R/A7S/A7II
Photography Gear Guide: Sony Lens Mount Adapters
Guide to Sony A7 / A7R / A7S / A7II Lens Mount Adapters – Part 1

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2 thoughts on “Firmware Updates for Metabones EF-E Smart Adapter Mark IV”

  1. Elizabeth Rossano

    Hi, I made the mistake of leaving my adapter connected to the lens the first time I plugged it in. The app won’t recognize it and now I think it isn’t supporting IS on my canon lens for my panasonic MFT camera. Do you know how to recover it? Thank you so much!

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