Sigma 70-200 2.8 APO on 5D Mark III - no autofocus?

Started Apr 13, 2012 | Discussion thread
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Jim Garrison
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Sigma 70-200 2.8 APO on 5D Mark III - no autofocus?
Apr 13, 2012

Just got my 5D Mark III and tried it with my Sigma 70-200 (first version) and the lens will not autofocus.

The lens autofocuses fine on my 50D, AND gives focus confirmation on the 5DIII if I focus manually.

Is this a known problem?

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Jim Garrison
jhg@acm.org

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