Sigma 17-70mm F2.8 autofucus issues

aderowlands81

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Ade
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Ladies and gents, not sure if this is the correct forum for my post, if not I apologise. As the title suggests I'm having some problems with the autofocus on this lens, using it on a Canon 40d the autofucus just hunts for a good few seconds then when it settles nothing in the viewfinder is in focus. Lens was purchased new about 4 months ago, I did have a quick go when I got it and noticied nothing immediaelty wrong and the couple of times I've use dit after that I'd used manual focus, in testing things today before a planned trip I noticed this issue, have contacted the place I purchased it from, just waiting to hear back from them but was wondering if anyone else has had similar problems with this lens at all.
 
Lens now going back to Sigma to be looked at through the warranty so not such a bad day afterall.
 
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