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Thread: What's wrong with my Sigma 135-400mm?

  1. #1

    Default What's wrong with my Sigma 135-400mm?

    When I lift the lens upside down, the head came out by its
    own weight, sometimes when shoot steeper than 75 degrees,
    it slips back. I am now zooming by push-pull instead of using
    the zoom ring. Am I doing the right thing?

    I used it less than 10 times, but saw some dust particles
    inside the lens, what shall I do now?

  2. #2

    Default Re: What's wrong with my Sigma 135-400mm?

    There's nothing wrong with your lens. That's just the way + quality the lens is built. As for dust inside, it is prob due to the push-pull action of zooming the lens. Inevitable if you ask me unless you don't use it at all.

  3. #3

    Default Re: What's wrong with my Sigma 135-400mm?

    Zoom creep happens to big and heavy lens. Even on some light lens so it's rather natural

  4. #4

    Default Re: What's wrong with my Sigma 135-400mm?

    Quote Originally Posted by DEADMETAL
    Zoom creep happens to big and heavy lens. Even on some light lens so it's rather natural
    Thank you, so this is lens creep. What is the term for situations when lens go back & forth
    in order to focus on the subject?

  5. #5

    Default Re: What's wrong with my Sigma 135-400mm?

    Quote Originally Posted by dRebelXT
    Thank you, so this is lens creep. What is the term for situations when lens go back & forth
    in order to focus on the subject?
    That's call "hunting".
    E.g. usage: "This lens always hunts in low light, cannot lock focus."

  6. #6
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    Default Re: What's wrong with my Sigma 135-400mm?

    Quote Originally Posted by DEADMETAL
    Zoom creep happens to big and heavy lens. Even on some light lens so it's rather natural
    This means louzy design & construction man! Even Nikon AF 70-300mm f/4-5.6 ED lens have this problem too.
    Last edited by Spectrum; 3rd October 2005 at 03:18 PM.

  7. #7

    Default Re: What's wrong with my Sigma 135-400mm?

    Can't really say it's a lousy design, to have inner zoom, the lens will be way too long for normal storage.

  8. #8

    Default Re: What's wrong with my Sigma 135-400mm?

    What shall I do with the dust particles if I intend to sell the lens?
    They appear inside the lens, but not aware of any dust in pictures
    though?

  9. #9

    Default Re: What's wrong with my Sigma 135-400mm?

    What shall I do with the dust particles if I intend to sell the lens?
    They appear inside the lens, but not aware of any dust in pictures
    though?
    you can "find out" urself,
    dust is eveywhere....
    and especially in used lens,
    no one can prevent that.
    i think every used lens should have have some dust or particle inside the lens...
    leave it be... it wun affect ur pic quality a lot..
    in fact, u can't really feel it

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