March 18, 2015 at 6:40PM


Sony a7s, advice.

Im thinking about transitioning from canon to a Sony a7s. I would like to keep my canon glass on the a7s as i know this is possible.
i am very confused between the different types of adapters and which is best. What is the different between the metabones adapter and the speedbooser?



AFAIK the speedbooster doesn't work properly with the A7s. I wanted to rent that combo a few months ago and they recommended me to use the newest normal metabones instead.
So, this is just hearsay: I haven't had the change to try for myself.

The difference is that the speedbooster has a lens to correct for the added cropfactor. As a ' bonus' it adds 1 stop of light. A 2.8 lens suddenly is a 2.0 (on a GH4 with speedbooster).

March 19, 2015 at 2:44AM

Director, DOP, Writer, Editor, Producer

Thanks walter. I have heard the smart adapter IV (i think this is the latest model) is what i need. I just dont want to buy the set up to realise i have to shoot in crop mode or my IS doesn't work.

kieran ryan

March 19, 2015 at 2:32PM, Edited March 19, 2:32PM

I recently switched from a Canon 6D to the A7s. I bought a Commlite adapter for around $100 and I haven't had any issues with any of my lenses. This, however, is not a speedbooster - just an electronic adapter so you can still use Auto Focus with your lenses.

Because the camera is full frame, the most you'd be doing is giving yourself a vignette if you add it for use in full frame mode. In Philip Bloom's review, he added the metabones speedbooster for use only in APS-C crop mode. The helped reduce the rolling shutter issue that you'll experience in full frame mode while almost giving you the same field of view that you get in full frame mode. However, unless you plan on only shooting in crop mode, you'd still need another adapter to use for full frame shooting.

March 20, 2015 at 10:03PM

Brad Tennant
Director / Cinematographer

There are plenty of adapters out there on the market, however not all of them are electronic - which means you can't easily control the aperture of your glass. There's no need to use a speedbooster on the A7s as it's full frame - unless you're planning to run it in APSC mode.....which would just make it a full frame camera again so it'd be pretty pointless. As Brad mentioned Commlite and Metabones Smart Adapter Mark 4 are the best out there at the moment. I've got the Metabones and I love it! Works a treat! Though had I done a little more research I would have opted for the Commlite strictly for the huge price difference!

March 21, 2015 at 1:16AM

Promotions / Production

The commlite is looking like a good option. Only problem is, is I've heard there can be some nasty reflection issues. Do you know much on this?

kieran ryan

March 22, 2015 at 3:34PM

The metabones Mk III (not IV) didn't work for us with our Zeiss ZE (EF mount) lenses. Ended up getting the Zeiss E-mount 24 - 70. Great all rounder.

Anyone had experience with the Metabones Mk IV with ZE lenses on the A7s? We found the Mk III unusable it would disconnect so often... If it's better on the Mk IV i'll probably get one.


March 22, 2015 at 2:48AM

Dean Butler
Writer Director Shooter Editor

I had a A7S and Metabones IV - worked great, but auto focus was slow. I ditched the Metabones and the EF glass, bought Rokinon E-mount lenses. Can't even tell the difference. However the Cine Rokinons were much better for the follow-focus work than the photography-oriented Canon EF glass.

July 7, 2015 at 7:23PM

Alex Zakrividoroga

Your Comment