One of the key selling points of the Canon EOS R mirrorless camera is its backwards compatibility with Canon's vast range of EF lenses - 130 million produced so far and counting - not to mention 3rd-party lenses from the likes of Sigma and Tamron. This backwards compatibility is made possible by the new Canon EF-EOS R mount adapter.

So we've tested out the autofocusing system of the Canon EOS R mirrorless camera, firstly with the RF 24-105mm f/4 kit lens and then with a wide variety of EF lenses.

These include the:

• EF 70-200mm f/4
• EF 24-105mm f/4
• EF 100mm Macro f/1.8
• EF 85mm f/1.8
• Sigma 135mm f/1.8 Art
• EF 50mm f/1.8

You can see exactly how quickly and accurately each lens auto-focuses on the EOS R in the video above.

*Spoiler alert - all of them performed extremely well, indeed just as well as on a Canon DSLR...

For further info on exactly which Canon EF and EF-S lenses are officially compatible with the EOS R, there's a full list available here:

https://www.canon.co.uk/mount-...

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