Autofocus issues with Sigma 150 - 600 on 5D Mark III

[gulax99]

Hi all,

I recently upgraded my canon 75 - 300 lens to a sigma 150 - 600. I'm happy with the results so far however the autofocus is inconsistent. It often times won't autofocus on a subject at all.

I'm still a newbie and am wondering if there's any settings I should play around with, or if the 5D Mark III is too old to work well with this lens, and if I should consider getting a new camera body?

[kvbarkley]

I have had to sometimes kick the autofocus in the pants by focusing on something at a different distance, then are-focusing on my subject.