September 14, 2014 at 11:55PM


Does 3rd Party APS-C lens work with the EF to M43 Metabone Speed Booster?

I have a Sigma 30mm F1.4 DC and I want to buy a Tokina 11-16mm but I don't know if they will work with the EF to M43 Speed Booster so I can attach them to a GH4. I heard recently that Canon doesn't license out EF-S so then do the 3rd party lens use EF?

Also has anyone tried it and where can I find info about Canon not licensing out EF-S.


Is this the speed booster that you have:


If so, the description section states:

Not supported: EF-S lenses (some EF-S lenses may need modification)

Good luck!

September 16, 2014 at 4:24PM


Thanks for responding Alex. Yes that is the adapter. I guess the core of my question is: Do 3rd party lens for Canon APS-C cameras use EF or EF-S. I'm not finding any solid info about it.

September 16, 2014 at 5:53PM

Adam Flo

You probably know the following, but let me restate:

the Canon ASP-C sensor comes only with an EF-S mount. This mount can take only an EF or an EF-S. So, if a third party targets EF-S then it will be EF-S only.

As you know the reason behind the EF-S camera is having a smaller sensor and the reason behind the EF-S lenses is using less glass (which means you get more actual lenses from the same amount of material). So, the 3rd party EF-S lenses that target the crop format should not be reversely compatible with the EF mounts.

Now, that's the hardware part -- this is limited by the dimension and the lens protrusion into the camera body.

The software part is not driven by the EF or the EF-S standard. The protocols are proprietary Canon where only some manufacturers such as SIgma or Tokina might have full access. Or might not have. Thus, the reality is that the 3rd party EF-S lenses should be expected to have random ability to communicate with the camera.

This is the risk.

Inherently only three sources can give you the final answer: either canon but they dont test 3rd party lenses; the manufacturer of the lens after testing it with Canon but Tokina's website is silent on the actual information that a Canon camera can get from the lens:

which leaves you with only one option -- take your camera to a store and try the lens on.

Good luck!

September 16, 2014 at 6:42PM


Thank you so much for the help Alex! Yup that is what I thought, taking it to the store to test is my next step.

Adam Flo

September 17, 2014 at 12:59AM

Does a Rokinon 35mm 1.6 cinelens work with any of the speed boosters(this is for a GH4)? HELP please =(

September 18, 2014 at 9:18AM

Tommy Plesky
Director / D.P / Editor

As long as the Rokinon is an EF mount it will work with an EF to n MFT adapter or a Speedbooster. Meaning the lens will form the image on the sensor and you'll record the picture.

However the lens might not communicate with the camera -- this depends on how good Rokinon's lenses "cracked" the Canon protocols. This is not the speedbooster issue.

Thus, if the Rokinon can communicate with an-EF mount Canon camera then it is supposed to talk to an MFT camera. But, as usual, some things might get lost in translation.

Here is the SB I am describing:

Alex Zakrividoroga

September 18, 2014 at 5:18PM

The only difference btwn an EF-S and EF mount is physical, not electronic. Basically, there's an extra plastic flange that sticks out, preventing a EF-S lens from mounting on an EF camera.

The "modification" referred to above relates to using a cutting tool to remove that flange. Just google it, and you'll find lots of details. Mostly, it was done when EF-S first came out and people wanted to put the 18-55 kit lens on the non-EF-S mount 10D.

In short, there's no such thing as a 3rd party EF-S mount lens. Canon has never licensed that mount to anyone, and none of the 3rd party manufacturers really needed to, it's just an extra piece of plastic.

All 3rd party EF lenses that target the APS-C sensor will typically mount on a FF camera, just a question of whether the mirror will get in the way or not. It's not just aps-c lenses that might protrude too far into the camera, many legacy 35mm lenses do as well, hence the long list at the bottom of the product page indicating that those lenses need to be modified.

The Tokina 11-16 in particular will cover the sensor on a 1.3x APS-H crop on cameras like the 1D series. It will likely mount on the EF mount Speed Booster. There's already plenty of video on youtube where people have mounted the Nikon mount Tokina 11-16 on the Nikon->m43 Speed Booster.

September 19, 2014 at 6:46AM

Kin Lau

Kin hit it on the nose, but to summarize:

That Tokina lens is an EF mount, not an EF-S. The confusion is that its an EF mount (which we associate with FF incorrectly) that produces an aps-c sized image circle.

Its not a metabones speedbooster, so I dont get electronics, but I use the Tokina 11-16mm 2.8, Sigma 18-35mm f1.8 on my GH4 every day to great success.

September 30, 2014 at 6:25PM

Kam Nield

tokina 11-16, sigma 18-35 as well. havnt tried others

October 30, 2014 at 7:01AM

Kazu Okuda

Sigma 17-50 2.8 with IS works. I have one, very sharp and good allround-lens.

January 6, 2015 at 10:40PM

Lutz Leonhardt

While we are at Tokina, the Tokina 12-24mm does not work either, there is not enough diameter in the adapter for the full aperture of the lens to enter.

It is too bad, it would be easy to make one by just having a larger glass in the adapter as regular EF to M4T adapters work just fine.

August 15, 2015 at 12:23PM, Edited August 15, 12:23PM

Cary Knoop

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