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I bought the EF 70-200mm f/2.8 L IS II lens and the autofocus is not working. It's non-functional. I can use the lens in manual mode but not in autofocus. What could be the cause?

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    \$\begingroup\$ Jus a picky question: there is a switch on a left side of the lens labeled AF/M. Have you tried both positions? \$\endgroup\$
    – Crowley
    Commented Apr 25, 2017 at 16:08
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    \$\begingroup\$ Are you able to test the lens on another body? \$\endgroup\$
    – Philip Kendall ♦
    Commented Apr 25, 2017 at 17:25
  • \$\begingroup\$ On which camera body? Do you use an adapter? Have you bought a new one or used? \$\endgroup\$
    – Banzai
    Commented Jul 24, 2018 at 12:00
  • \$\begingroup\$ I've read that the autofocus doesn't work on the Canon EOS 70D. Is that your camera body? \$\endgroup\$
    – Kai Tiura
    Commented Jul 14, 2019 at 1:27

1 Answer 1

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Possible reasons why the AF on your EF 70-200mm f/2.8 L IS II lens isn't working:

  • The AF/MF switch is set to MF (manual focus).
  • You are attempting to focus an object at a distance from the camera, as measured from the focal plane mark on the camera body, that is less than the MFD (minimum focus distance) of the lens or is less than the distance limited by the Focus Limiter switch. If the FL switch is set to 2.5m-∞, you will still be able to manually focus from between the MFD of 1.2m and the limited distance of 2.5m, but the lens won't AF in that range.
  • The connection between the lens and camera is not being properly made when the lens is mounted.
  • You are attempting to use AF on a target that is too dark or too low in contrast to allow your camera's AF to function.
  • You are using the lens with an incompatible camera, or via a "dumb" or incompatible adapter.
  • You are using the lens with an incompatible or broken teleconverter or extender.
  • The AF in the lens is broken.
  • The AF in the camera body is broken.
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