Sigma lens auto focus

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Name
Chris Douglass
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Hi all
I’m Chris, I’ve been into photography for years and use a canon 5dmkii. My old faithful lens is a sigma 24-70mm dg and I love it to bits. On my last photo shoot though it started messing around. With the camera in landscape the focus is fine but turn it on it’s side (shutter button in the air) it tries to focus but can’t decide when to stop. Back to landscape not issues and angels all the way up to 90degrees fine just the last 5/10 degrees. I have tried it on different bodies with the same results and different lens work fine on my 5d. I thought it might be the contacts moving away from the camera so I would need a new ring mount. Any ideas?
 
Hi Chris and welcome. You may get more answers to your question. If you put it in the talk equipment section.
 
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