I picked up the Sigma MC-11 lens adapter that allows use of the Canon EF lenses to be used with the Sony A7iii e-mount system.

The first thing I did was update the existing firmware from 1.34 to version 1.37, I didn’t even bother researching what the changes would take effect.

My initial impression is positive. The MC-11 seems to work very well with a native Sigma lens. I have a 35mm 1.4 ART lens attached and the AF “feels” more responsive and less focus breathing.

I’m not a big fan of using adapters but since I have Canon L Glass (using a Metabones IV) and the mentioned Sigma ART. I did not want to migrate over to the Sony A7iii platform and spend a considerable amount of money trying to get the same focal length glass I already owned.

I was already satisfied with the optical quality with the hardware I owned so using the glass with an adapter with no degradation was very compelling.

I’m not sure if it is a normal function for the MC-11 with a Sigma lens. When I try to use the full MF mode it will not allow that menu function to be selected. I am able to select DMF “Direct Manual Focus” mode which I prefer using.

EDIT:
I was having issues using the Canon 70-200mm 2.8L lens with the Metabones V adapter. The focusing was noticeably off. Not only was it off it was consistent. There was a super cool looking bird on a branch and none of my shots came out clear using the 70-200mm.

I did some test afterwards using the Sigma MC-11 and 70-200mm and the results were spot on auto focusing. This came as a surprise as I had been reading the Metabones adapter was superior when using Canon glass and the Sigma was better when using its own glass.

This clearly was not the case. The Metabones does seem to have an edge in certain compatibility areas such as focus modes. The DMF seems to work better than Sigma.

I’m not sure if all this has to do with upgrading the firmware to both devices with the latest available. For now, my go to adapter is the Sigma.