Question about Sigma AF 70-300mm f/4.0-5.6 DL Macro Super Lens for Canon-EOS

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Not working with Sony Alpha 100

After months of no trouble, when turning the Sony Alpha on, there are several seconds of loud vibration and the lens will not auto focus. The same noise occurs when switching off.

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  • Balmoth Mar 23, 2008

    Glad to know I am not the only one with this problem. My lenses is having the exact problem. I was taking some pictures. turned off the camera. Turned it on and bam, it made a jammed noise. I thought it was the camera reaction to a very low temperature. But when I got to a warm place and changed the lens I understood the problem was in the lens itself.
    It seems the autofocus engine is stuck into infinity (even if I manually set it to a different distance when turned on it goes back to infinite). Lucky is still inside the warranty, but unfortunately I am on holiday so it will take some days until I can get it to the shop. If in the meantime some has any idea or solution to this problem it help alot.
    My camera is also a Sony Alpha 100 and had this lens working for the past 3-4 months with no problems

  • lancelot1 Mar 30, 2008

    I have exactly the same problem using the lenses with Konica Minolta 5d. Suggestions for solving the problem?

  • avionz Apr 06, 2008

    Thanks for your comments, they are appreciated. I contacted the New Zealand Sigma agent who said he could fix the problem but I would have to pay approximately $200. As it was under warranty, I declined and felt aggrieved that I would only be covered if I returned the lens to the point of sale, which was New York. Warranties should be global.

  • photodad Jun 06, 2008

    I have the same problem on a km 7d. This will be the second time and I still have no answer from sigma as to what it is. The first time my lens was replaced, this time I don,t know what will be done

  • Anonymous Dec 25, 2008

    I got the same problem today!!!



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Well after a week in the shop it came back working. the guy at the shop could only tell me that the repair people had fixed a problem in the auto focus (he had no other information). So the solution here is going to a place to repair your lens. if someone finds the cause of this problem it would be great

Posted on Apr 06, 2008


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