EOS R with Lenses and Extenders

Autofocus with Extenders on Mirrorless Cameras (Podcast 674)

This week we explore how using various combinations of lens and Extender/Teleconverter affects autofocus on the Canon EOS R down to aperture f/11.

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Martin Bailey
Martin Bailey is a nature and wildlife photographer and educator based in Tokyo. He's a pioneering Podcaster and blogger, and an X-Rite Coloratti member.
  • Robert Kite
    Posted at 05:21h, 21 April Reply

    Hey Martin – how would I enable/disable the internal extender on my EOS R?

    • Martin Bailey
      Posted at 09:25h, 22 April Reply

      Hi Robert! Sorry for the confusion. The “internal” extender that I mention is built into the 200-400mm lens, not the camera. There is no internal extender in the EOS R.

  • Greg Chapman
    Posted at 01:34h, 13 October Reply

    Thank you so much for this valuable information Martin. I am new to the photography and am trying to learn what I can before I invest in a camera (which will be the EOS R) and other gear. Your clear explanation and use of video for demonstration is outstanding and very much appreciated.

    • Martin Bailey
      Posted at 07:50h, 14 October Reply

      You’re welcome Greg. Glad you found this useful.


  • Quazi Sanjeed
    Posted at 13:37h, 05 January Reply

    Hi Martin. Great review, thank you for that.

    Being a Canon DSLR user, I’m one step away from getting my first MILC. Just one question remains to be addressed.

    What will happen if I stack two extenders for getting maximum reach? On a f/2.8 telephoto lens, aperture will go down to 8 and 11. But will the combo AF on EOS R or R6?

    Thank you in advance.

    • Martin Bailey
      Posted at 20:34h, 05 January Reply

      Hi Quazi,

      Great question. The Canon mirrorless cameras can autofocus down to f/11, so yes, you’d still be able to use that combination with AF on the EOS R and R6.

      I hope that helps!


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