Performance

The 4 Sigma EF lenses that successfully autofocused with the Sigma adapter were the 20mm, 24mm, 35mm and 50mm (all f/1.4). The MC-11 adapter provided fast and accurate PDAF and the full range of AF functions for stills, including focus tracking and Eye-AF.

The 7 Canon EF lenses that successfully autofocused with the Sigma adapter were two different versions of the 50mm f/1.8, 17-40mm f/4, 24-105mm f/4, 85mm f/1.8, 70-200mm f/4 and the 100mm f/2.8 macro. Note that not all of the Sony focusing modes are available when using Canon lenses, most notably Eye-AF.

The 1 Canon EF lens that just wouldn't work with Sigma's adapter wasn't actually a Canon lens - it was the old Tamron 24-70mm f/2.8.

Also bear in mind that manual focusing still works, even on lenses where auto-focusing doesn't. The Sony A-series really is a joy to use in this regard, with the combination of excellent focus peaking and a large electronic viewfinder making it a cinch to manually focus.

Conclusion

In summary, the Sigma MC-11 adapter successfully allows you to use both Sigma and Canon EF lenses on the excellent Sony A7-series mirrorless cameras complete with quick and reliable autofocusing without adding too much weight or bulk to the overall system. While Sigma officially only support a small number of their own lenses, our quick and dirty test of every Canon lens that we could lay our hands on reveals that the majority of those work almost just as well too, making the £220 / $250 asking price look very good value compared to the pricier Metabones alternative.

As ever when trying to use third-party adapters with third-party lenses on a native system, your mileage may vary, but we were largely successful in trying to use a Canon lens via a Sigma adapter on a Sony camera. Who would have predicted that?!

We'll continue to do some long-term testing of the MC-11. In the meantime, have you used the Sigma MC-11 Canon Mount EF adapter with any of the Sony A-series cameras (including the APS-C NEX/A5000/A6000 cameras), with Sigma and/or Canon lenses? Let us know how you got on in the Comments section below.

Ratings (out of 5)
Design	4.5
Features	4.5
Ease-of-use	4.5
Value for money	5

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