Metabones Firmware Update Adds Continuous AF and Increases Speed

Metabones has released an update to its EF-E Smart Adapter MARK IV and EF-E Speed Booster ULTRA, vastly improving auto focus, smoother aperture adjustments and enabling continuous auto focus on compatible Sony Alpha cameras.


Many Canon-turned-Sony users will have become accustomed to the compatibility quirks of using EF lenses on a Sony Alpha body. Metabones has been an ever present stalwart in the big player camera/lens mis-match and, despite their best efforts, have always struggled with producing reliable auto focus.

This hasn’t been a huge problem with filmmakers, many of whom won’t ever have the need for this feature. But many will also like to cross over to photography from time to time, one of the features that was so liberating with the Canon 5D. A lack of auto focus in stills photography is of course a much bigger deal, especially with the release of more advanced systems introduced with mirrorless cameras such as the A7RII and A7SII.

The mis-match in Sony body/Canon lens compatibility has forced many into exploring the less nurtured, less developed, less exciting Sony E mount lens line. These of course make full use of the Alpha cameras’ auto focus abilities, particularly the aforementioned continuous modes in newer bodies.


The firmware update that Metabones just released for its EF-E Smart Adapter MARK IV and EF-E Speed Booster ULTRA closes the gap dramatically between native E mount and Canon EF lenses.

With Metabones firmware V0.50, auto focus on an EF lens is much improved, aperture changes are smoother (still clicky, but improved) and continuous auto focus is now enabled on later compatible bodies.

Here’s some press:

  • Release date: 23 Jun 2016
  • Benefits and improvements:
    • Wide-open button functionality is removed on A7 series and A6300. The button of the adapter is now dedicated to the function of the customisable Focus Hold button on the A7 series and A6300.
    • “Advanced” mode is now the default operating mode. (Note: you may permanently change the default to “Green” mode, by holding down the button on the adapter while attaching to an already-on camera, and then, without ever releasing the button, turn off the camera’s power. Changing the default back to “Advanced” mode using the same procedure.)
    • “Native” autofocus features including DMF, Eye-AF and fast CDAF on all E-mount cameras (see Press Release for details).
    • Support for smooth iris feature of the latest Canon and Tamron SP lenses.
    • PDAF improvement for Canon EF 50/1.4 USM and some other large aperture fixed focal length lenses.
    • Descriptive lens name on EXIF LensModel tag (except on older cameras and Metabones Mark I, Mark II, Mark III and the original Speed Booster). A compliant utility such as exiftool is required. Sony Image Data Converter does NOT display the LensModel tag.
    • Fixed a focus parking issue after an exposure with some older Canon lenses.

I’ve installed Metabones Firmware 0.50 on my EF-E Smart Adaptor and can confirm the improvements. As an owner of the Zeiss 25mm Batis lens, I’m fairly familiar with the continuous focus modes available on the A7R II and A7S II. Users of the Sony Alpha II/Metabones/EF combo can now look forward – under certain circumstances – to a useable focus mode when shooting video, featuring face detection, zonal monitoring, with speed and sensitivity modes.

Speaking from a wealth of experience with Canon’s Dual Pixel Auto Focus, the Sony equivalent is more complicated, less reactive and less subtle, but it does the job on wide focal lengths stopped down.

Whilst auto focus is vastly improved, initial experience suggests it’s not quite up to native E mount speeds, but it’s certainly getting there.

You can download firmware update V0.50 now from here.

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Syed Mustafa Sabir Reply
Syed Mustafa Sabir June 24, 2016

Samad Khan i told you :)

Markus Lubenica Reply
Markus Lubenica June 24, 2016

AF is generally overrated and those adapters overpriZed. No matter how much manufacturer bound affiliate marketing you produce :P

cinema5D Reply
cinema5D June 25, 2016

You are right, the $5 we probably make off this post’s affiliate links make it definitely a “marketing” post. But look out for those chemtrails too, the Russians are behind it and it’s controlling your weather. #irony Nino

Markus Lubenica Reply
Markus Lubenica June 25, 2016

You sound like the common Russophile neocon/neolib U$ regime narrative. Affiliate marketing manners & claims are always the same, doesn’t matter on which marketing platform CMS you focus on. Especially your techniques of public outrage management definite needs a recalibration.

Alvaro García Undurraga Reply
Alvaro García Undurraga June 25, 2016

Markus Lubenica, affiliate links help pay for site maintenance costs. I assure you, cinema5D’s creators aren’t getting super rich with them

Markus Lubenica Reply
Markus Lubenica June 25, 2016

Doesn’t matter. Come and get a real job like everyone else if your paycheck isn’t high enough to pay your maintanace costs.You’re just not authentic snatching „like tourists“ and so called „followers” for your own $$$$$ in the Facebook™ ranking system. Second, acting as industries 24/7/365 lobster on this brute force affiliate marketing platform and collecting $$$$$ user metadata for SEO/SEM $hareholders by creating some pseudo tests, reviews, recommendations aso – also isn’t authentic. It’s always the same plastic manner :P

 Kenneth Chan Reply
Kenneth Chan June 25, 2016

Have no idea what this guy is smoking… but I kinda want some.

cinema5D Reply
cinema5D June 25, 2016

Markus Lubenica Right, if it’s all so terrible, why do you bother reading our site and commenting on evil, evil Facebook. Oh the irony.

Markus Lubenica Reply
Markus Lubenica June 25, 2016

Clever manoeuvre , but you seem to be stuck in an infinite loop with your well known claims. Your pre-scripted dramaturgy leaves much to be desired.

Alvaro García Undurraga Reply
Alvaro García Undurraga June 25, 2016

Markus, the site IS the paycheck… you think all websites are hobbies? “Everyone else” who has a website considers the website their “real job” otherwise there wouldn’t be any websites, is that what you want?

Alvaro García Undurraga Reply
Alvaro García Undurraga June 25, 2016

btw nice non-argument there

Markus Lubenica Reply
Markus Lubenica June 25, 2016

Alvaro García Undurraga you don’t get it. I told exactly the 180° turnaround of your act-theoretical semantics. Second i would not agree to your last sentence. De facto there are enough ppl who host a website without any ambivalent monetary demand function or control in mind. But this wasn’t the question. I’d suggest to check your backlog again.

Alvaro García Undurraga Reply
Alvaro García Undurraga June 28, 2016

You’re an odd person

Markus Lubenica Reply
Markus Lubenica June 28, 2016

And you strongly need a new haircut! So what? ;)

Dominik Lang Reply
Dominik Lang June 24, 2016

Florian DahmManou Krp

Florian Dahm Reply
Florian Dahm June 24, 2016

Sigma mc-11

Todd Skougor June 24, 2016

Have you ever used the MB Speedbooster? Those that have would never say something so stupid.

Andrea Rascaglia Reply
Andrea Rascaglia June 25, 2016

AF with metabones It’s shit anyways

Timothy Huang Reply
Timothy Huang June 25, 2016

Kengkue Her finally

Kengkue Her Reply
Kengkue Her June 25, 2016

Have u tested it yet? How much improvement is it?

Tim Fok Reply
Tim Fok June 25, 2016

Yes it’s improved, more decisive. Not as fast as native mount lenses but certainly much better than before.

Riley Endicott Reply
Riley Endicott June 25, 2016

Does the original a7s not benefit as much as the mark II cameras? I’m noticing more bugs that fixes as autofocus is still so slow and inaccurate its unusable for stills.

Also, clear image zoom won’t work in advanced mode. It says its disabled. But for some reason when I zoom my tamron 24-70 out to 70 mm it automatically puts a 1.1x clear image zoom magnification on the image. It never did this before I updated and is frustrating. Anybody else experiencing something similar?

Tim Fok Reply
Tim Fok June 25, 2016

That sounds like it could be MF assist?

MF assist is a feature in manual focus mode, when you engage the focus wheel you get an automatic punch in.

It only works on compatible lenses, maybe this update has enabled it on your Tamron but it’s getting confused with the zoom?

You can find MF Assist in the menu.

Melvin Chong Reply
Melvin Chong June 25, 2016

Everyone complains about teleconverter reduces quality, but I don’t see anyone complaining when using metabones focal-reducer…. 😕

Anthony Balmforth June 26, 2016

I updated and tried with my sony a7sii, and now when I change aperture, there is a loud clicking sound coming from the lense that it didn’t make before. I tried with the canon 24-105, and a tamron 70-200 VC… Anyone else have these issues???

brandon puet June 27, 2016

I’ll try when I get home. Is the AF any faster?

VanWeddings Inc June 28, 2016

I also noticed that. Also, the Clear Image Zoom no longer works after I updated the Metabones firmware (nothing changed with the camera). Strange coincidence?

Cam Macduff Reply
Cam Macduff June 26, 2016

Mikel Taylor Dean Zillwood

Lukas Medialook Reply
Lukas Medialook June 26, 2016

would that work with FS5?

Brian Wiley June 30, 2016

is it possible for metabones to make an anamorphic speedbooster? maybe the anamorphic glass should be behind the lens instead of the front.
I emailed them about this but of course, no answer.

Vinicius Berger October 4, 2016

Anyone Having trouble with IS on canon lenses after upgrading Metabones to this firmware?
After upgrading, IS is not working anymore on my lenses. I have both Speedbooster Ultra and Mark IV, and tested on a A7S 1 and FS5. Lenses: 24-105mm f4 IS, 70-200 f4 IS and 25mm f2 IS.

Tekeste Ghebretensae October 28, 2016

I am new to this site,and first time using metabones speedbooster,I am just wondering are they talking about photo or video mode when they say autofocus is working with Gh4 on canon lens,I read in youtube that they upgraded and is working,but I hear a lot of noise when I try autofocus in video mode.
Kan some one help me with this,is there any posibility to get this working and use my canon lenses.
Thank you