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Sigma 28-300 3.5-6.3 won't focus

My Sigma 28-300mm lens won't focus and take a picture on auto-focus. It just continues to try to focus in and out but never allows me to take the picture. I am using it on my Canon Rebel Xti.

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Did it ever work on this camera?
I have seen some Sigma lenses that are auto focus on canon film cameras but then when put on the digital they dont work right. If you have used it on this camera then make sure the lens is clean.sometimes dirt on the front wil make it try focusing on the dirt. Next try focusing in manual focus to make sure the focus is working. Then take the lens off and then put it back on and make sure it clicks into place.

Let me know if none of those things work. also make sure to try focus on something close and somthing far away.

let me know how it works,
Caleb

Posted on Jul 02, 2008

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Posted on Jan 02, 2017

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I hope this helps, 
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It's probably broke then. Clean the contacts to the camera and try again. If it still don't work you can probably be sure it is likely to be a bit faulty. Check the camera has auto focus mode enabled if appropriate.

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