How common are focus problems with Canon 6d and third party lenses?

Started Jul 31, 2014 | Questions thread
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How common are focus problems with Canon 6d and third party lenses?
Jul 31, 2014

I rented a Canon 6D as a trial to determine if I wanted to buy one.  My canon lens worked great, but both of my Sigma lenses had intermittent problems with focusing --- either continually searching and then finally locking onto focus, or making a whirring noise and not being able to focus at all. Several times I had to turn the camera off in order to get the Sigmas to work properly, for a short time.   These lenses are not EF-S lenses.  I have had no problems with either Sigma lens on my T2i.

Is this focus problem a common occurrence with the 6D and third party lenses?

 HappyTailz's gear list:HappyTailz's gear list
Canon EOS 550D Canon EOS 6D Canon EF-S 18-55mm f/3.5-5.6 IS Sigma 50mm F2.8 EX DG Macro Sigma 1.4x EX DG Tele Converter +3 more
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Canon EOS 550D (EOS Rebel T2i / EOS Kiss X4) Canon EOS 6D
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