Sigma 150-600 Sport suddenly stopped auto focusing...

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Michael Leek
Michael Leek Regular Member • Posts: 137
Sigma 150-600 Sport suddenly stopped auto focusing...

I have a relatively new Sigma 150-600 mm Sport lens which I’ve been using with my Canon 5D Mk III. For the first few weeks the lens worked as designed, but suddenly, today, it stopped auto focusing! The problem is regardless of focal length.

I’ve disconnected the lens from the camera body, switched the camera on and off a number of times and have changed the settings on the lens, but nothing has resolved the problem with the auto focus. Light conditions today have been excellent, so it’s not as if the lens is struggling through lack of light.

Does anyone know of a solution to this problem? Any help gratefully received!

By the way, I did not purchase a Sigma USB Dock when I bought the lens.

 Michael Leek's gear list:Michael Leek's gear list
Canon EOS 5D Mark III Canon EOS 6D Canon EF 400mm f/5.6L USM Canon EF-S 17-85mm f/4-5.6 IS USM Canon EF 100-400mm f/4.5-5.6L IS USM +14 more
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