Sigma MC-11 : Canon EF to Sony A7R II compatibility report.

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alpshiker Regular Member • Posts: 443
Sigma MC-11 : Canon EF to Sony A7R II compatibility report.

We had a discussion in this other thread about the best adapter solutions to date for Sony A7r II. I was suggested to try the Sigma MC-11 before resorting to more costly solutions. I received the adapter today, and here is my report. I make it another thread for the sake of the search engines, since the title of the older thread is misleading.

The A7R II came with FW 4.0

The MC-11 has FW 1.20. I know that there is a newer firmware, but I hesitate replacing a recipe that works. Maybe at a later date. This late build has no longer the green diode that I have seen in some reviews. It feels solid, fit is tight but not exceedingly.

My L lenses are over ten years old versions, with the exception of the 4.0/ 16-35 which replaced a f2.8 I had before.

I can report the following after fitting the lenses and making a quick assessment of the usability of the AF.


EF-L 4.0/16-35mm: Almost on par with Canon 1Ds3.

EF-L 4.0/ 24-105mm M1 : Almost native speed.

EF-L 1.4/ 35mm: Almost native speed, even in low light.

EF 1.4/ 50mm (non-L) : Problem with that one. The AF does not react at all and the lighting informations seem inaccurate (dark image). It eventually became brighter when I switched the AF off, but then the whole camera froze. Caution needs to be applied as other user Zebebito reported damage to his lens due to an adapter (Commlite?): AF out of order even on Canon. I have an older adapter branded "King" on which the lens works fine when the AF is switched off (AF continually hunts).

EF 2.4/ 50mm macro (non-L) : Works very well, a good surprise.

EF 1.8/ 85mm (non-L) : Almost native speed.

EF-L 1.2/ 85mm M1: Incremental, but fast and precise, even in low light. That was a very good surprise! That lens is not very fast on Canon either due to the heavy glass.

EF-L 2.0/ 135mm and 1,4x II extender. Very fast, with and without the extender. Almost native speed. Good in low light too. It hunts a bit when you change from close to far, but once registered at the right average distance range, it is fast.

EF-L 4.5-5.6/ 100-400 M1 : Takes a whole second to focus incrementally, but works surprisingly well when there is enough light and the subject has enough detail. Works on the lens's whole range.


I have not tested continuous AF yet.

Bottom line is that due to its compatibility with most of my lenses and speedy AF, this adapter is a very useful addition to my new Sony A7r II. I can now consider replacing the gigantic 1Ds3 with a much lighter body for photographing people (I used the Sony A7R so far for stills and landscape). I thank the contributors who leaned me towards that choice, instead of the cheaper brand!

Sony a7R Sony a7R II
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