Question about Sigma Cameras

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I have a Sigma 18-200 3.5-6.3 lense and use it on a Canon xTi Rebel. The lense is a year old and have recently noticed that at the 18mm focal length that the f stop no longer opens up to 3.5 but only to f4. I have not dropped or jarred the lense. Also I have noticed that at the 200mm focal length the f stop opens up to 5.6 not the 6.3. Any advise would be appreciated. Jim Caldwell

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  • gotcaldwell Dec 21, 2008

    I cleaned the gold contacts and it does not seem to have helped. Any other advise would be greatly appreciated. Thank you.
    Jim Caldwell

  • gotcaldwell Dec 21, 2008

    Any idea why this lense would show these problems after a year of working well? And do you have any other suggestions to try before sending it in for repair? Thanks.
    Jim Caldwell

  • gotcaldwell Dec 21, 2008

    I am going to contact Sigma and ask them if I will need to send the lense in. I will let you know the outcome. Also I plan on exchanging lenses with a friend that shoots with a Canon to see if the problem occurs with a different lense. Thanks.
    Jim Caldwell

  • gotcaldwell Dec 24, 2008

    I took my lens and put in on a friends camera and it did the same thing. That leads me to think that it is a problem with the lens and not the body. I have also contacted Sigma and they reccomend that I send the lens in. I will let you know how this turns out. Thanks for all your help.
    Jim Caldwell

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Replace the lens and you should be all set

Posted on Dec 24, 2008

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Yes its the lens problem and contacting sigma will definately help you if they provide u with the replacement lens.and also check out with your friends lens and let us know. keep us updated. thanks.

Posted on Dec 21, 2008

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Its possible that either wear and tear got to it or it went off thread. If that is the case then the only thing is repair. Since it is opening up to a point that means that its either dirt or threading. So basically no other options left.

Posted on Dec 21, 2008

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There's a big possibility that the lens is already bad and needs a replacement.....

Posted on Dec 21, 2008

  • Mark Gil
    Mark Gil Dec 21, 2008

    That will be better trying a different lens so if the other lens work fine this lens that you have really needs a replacement already...

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Please clean golden terminals of Sigma 18-200 3.5-6.3 lens, may have got clogged / dirt.


Posted on Dec 21, 2008

  • Shahid Electronics
    Shahid Electronics Dec 21, 2008

    Please perform RESET camera function while Sigma lens is attached with camera.
    This will help to set camera and lens mechanism to clean any firmware glitch, if any.


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